Phytogenic Additives Can Modulate Rumen Microbiome to Mediate Fermentation Kinetics and Methanogenesis Through Exploiting Diet–Microbe Interaction

In the paper

“Besides, microbial cell biomass is also utilized as the primary origin of protein and amino acids by host animals (3).”

What the sources say

• Partly supported

  The opening section reports that, for a wide range of normal diets, 60–85% of the protein passing to a ruminant’s small intestine is of microbial origin, and that rumen microbes synthesize amino acids. This supports the claim for ruminants, but not its unqualified extension to host animals generally. The supplied passage does not give a page number. (LLM, conf=0.83)

  cites [3] Storm, 1983, The nutritive value of rumen micro-organisms in ruminants: 1. Large-scale isolation and chemical composition of rumen micro-organisms, Br J Nutr. sourceExperimental — accuracy not yet measured

In the paper

“Plant secondary metabolites are natural substances with the potential ability to alter rumen fermentation without causing microbial resistance, and their residual effects can positively affect the animal end products (27, 28).”

What the sources say

• Partly supported

  The Abstract describes plant secondary compounds as promising natural manipulators of rumen fermentation. In “Essential oils and ruminants” (page not provided), the paper says one comparison suggested ruminal bacteria did not adapt to essential oils, but it does not establish that plant secondary metabolites generally avoid microbial resistance. “Future Prospects” discusses possible improvements to ruminant products while warning that additives could adversely affect meat or milk quality; it does not report positive residual effects on end products. (LLM, conf=0.87)

  cites [27] Wallace, 2002, Natural products as manipulators of rumen fermentation, Asian-Australas J Anim Sci. sourceExperimental — accuracy not yet measured
• ?Not checked — no full text of the sourcecites [28] Kholif, 2020, Phytogenic feed additives mixture enhances the lactational performance, feed utilization and ruminal fermentation of Friesian cows, Animal Biotechnol. source

In the paper

“During rumen fermentation of feed, some by-products are additionally produced, such as CO2 and H2, which are further converted into CH4 by some methanogens like Methanopyrales, Methanomicrobiales, Methanobacteriales, Methanococcales, Methanocellales, and Methanosarcinales).”

What the sources say

• ?Not checked — no full text of the sourcecites [6] Stewart, 1997, The rumen bacteria source
• ?Not checked — no full text of the sourcecites [7] Paul, 2012, Methanoplasmatales: thermoplasmatales-related archaea in termite guts and other environments are the seventh order of methanogens, Appl Environ Microbiol. source
• Partly supported

  Our copy says that rumen methanogens in Methanobacteriales and Methanomicrobiales use H₂/CO₂ produced during fermentation (Abstract; page unavailable). It does not identify Methanopyrales, Methanococcales, Methanocellales, or Methanosarcinales as rumen methanogens carrying out that conversion; the Rumen metatranscriptomics section instead identifies Methanobacteriales and RCC Thermoplasmata in the sampled rumen community. (LLM, conf=0.88)

  cites [8] Poulsen, 2013, Methylotrophic methanogenic Thermoplasmata implicated in reduced methane emissions from bovine rumen, Nat Commun. sourceExperimental — accuracy not yet measured

In the paper

“However, most chemical additives either are noxious to host animals or present a temporary impact on methanogenesis (24, 25).”

What the sources say

• Partly supported

  Section 3.1.1 (Direct inhibition; page unavailable) reports that chloral hydrate caused liver damage and death in sheep, while several other methane inhibitors had effects that declined or were transient. It does not establish that most chemical additives overall are harmful to host animals or have only temporary effects; it also describes an inhibitor combination that may suppress emissions over a prolonged period. (LLM, conf=0.82)

  cites [24] Moss, 2000, Methane production by ruminants: its contribution to global warming, Annal Zootechnie. sourceExperimental — accuracy not yet measured
• ?Could not verify

  The Introduction (page not available) discusses concern about antibiotic residues in meat and milk, not harm to host animals from most chemical additives. The Discussion (page not available) mentions methanogenesis but does not say that chemical additives have only a temporary effect on it. Searches for additive toxicity and temporary effects found no passage supporting the claim. (LLM, conf=0.76)

  cites [25] Khattab, 2017, Impact of lemongrass and galangal as feed additives on performance of lactating Barki goats, Int J Dairy Sci. sourceExperimental — accuracy not yet measured

In the paper

“Some archaea (Methanoplasmatales or Thermoplasmatales) can also form CH4 through other substrates, such as methanol and mono-, di-, and tri-methylamine (6–8).”

What the sources say

• ?Not checked — no full text of the sourcecites [6] Stewart, 1997, The rumen bacteria source
• ?Not checked — no full text of the sourcecites [7] Paul, 2012, Methanoplasmatales: thermoplasmatales-related archaea in termite guts and other environments are the seventh order of methanogens, Appl Environ Microbiol. source
• Supported

  The “Methylotrophic methanogenesis from methylamines” section identifies transcripts for pathways using methanol and mono-, di-, and trimethylamine in rumen Thermoplasmata. The same section reports increased methane production after trimethylamine was added to rumen fluid, supporting the claim’s broad description of these archaea as methylotrophic methanogens. (LLM, conf=0.88)

  cites [8] Poulsen, 2013, Methylotrophic methanogenic Thermoplasmata implicated in reduced methane emissions from bovine rumen, Nat Commun. source

In the paper

“Moreover, the rumen microbiome varies significantly among different animals, but intra-animal variation in microflora is quite less (16).”

What the sources say

• ?Could not verify

  The Whole Bacterial Community Analysis section (page unavailable) compares cows before and after pomegranate-extract supplementation and reports significant changes at the higher doses. It does not compare variation among animals with variation within the same animal. Searches for inter-animal and intra-animal variation found no passage establishing the claimed relationship. (LLM, conf=0.72)

  cites [16] Jami, 2012, Effects of adding a concentrated pomegranate-residue extract to the ration of lactating cows on in vivo digestibility and profile of rumen bacterial population, J Dairy Sci. sourceExperimental — accuracy not yet measured

In the paper

“Highly efficient animals produce less CH4 and produce more milk, consuming less feed owing to their unique set of rumen microbiome (13).”

What the sources say

• Partly supported

  In “Global agricultural challenges” (page not provided), the review says more feed-efficient steers require less feed to achieve the same production parameters—not that they produce more milk. In “Developing microbiome biomarkers for prediction of ruminant phenotype” (page not provided), it links rumen microbial differences to feed efficiency and suggests some may also reduce methane, but presents that connection cautiously rather than as a general trait of highly efficient animals. (LLM, conf=0.88)

  cites [13] Huws, 2018, Addressing global ruminant agricultural challenges through understanding the rumen microbiome: past, present, and future, Front Microbiol. sourceExperimental — accuracy not yet measured

In the paper

“However, genetic manipulation of rumen microbiota is also possible through different techniques as host genetics influences some heritable microbial traits (81–83).”

What the sources say

• Supported

  The Abstract Conclusions say some rumen microbial features are heritable and could be influenced by host genetics, creating potential to manipulate the microbiota through genetic selection and breeding. The Conclusions also discuss combining genetics-based and management-based approaches. The paper frames manipulation as a potential strategy, not an intervention it demonstrated. (LLM, conf=0.87)

  cites [81] Li, 2019, Host genetics influence the rumen microbiota and heritable rumen microbial features associate with feed efficiency in cattle, Microbiome. source
• Partly supported

  The sections on heritability estimates and host–microbiome interactions report heritable microbial features and links to host genetics. The role-of-rumen-microbiome section describes genetic selection for a desirable profile as a potential, not an established means of manipulating rumen microbiota through different techniques. Page numbers are not available in the supplied passages. (LLM, conf=0.85)

  cites [82] Brito, 2020, Genetic mechanisms underlying feed utilization and implementation of genomic selection for improved feed efficiency in dairy cattle, Can J Anim Sci. sourceExperimental — accuracy not yet measured
• Partly supported

  In “Efficiency in the Rumen Microbiome” (pp. 21–22), the paper reports heritable microbial traits and says host genetics may influence the rumen microbiome. It proposes genetic selection as a possible future way to manipulate the microbiome, but does not establish that genetic manipulation is already possible through different techniques. (LLM, conf=0.86)

  cites [83] Terry, 2020, Invited review: strategies to improve the efficiency of beef cattle production, Can J Anim Sci. sourceExperimental — accuracy not yet measured

In the paper

“Rumen bacteria play a dominant role in fiber digestion, although anaerobic fungi and protozoa have been reported to contribute to lignocellulose breakdown by attacking lignocellulosic material differently (60, 64) and discharging different enzyme complexes (101).”

What the sources say

• Partly supported

  The Proteomics section reports secreted plant-cell-wall-degrading enzymes in anaerobic fungi, and the Genomics section describes fungal cellulosomes as multi-enzyme complexes that accelerate lignocellulose degradation (pages unavailable). These passages support the enzyme-complex point for fungi, but do not establish that protozoa discharge different enzyme complexes. Citation (101) is attached to the enzyme-complex phrase, not the preceding claim about bacteria’s dominant role. (LLM, conf=0.82)

  cites [60] Edwards, 2017, PCR and omics based techniques to study the diversity, ecology and biology of anaerobic fungi: insights, challenges and opportunities, Front Microbiol. sourceExperimental — accuracy not yet measured
• Partly supported

  Citation (101) is attached to the claim about discharging different enzyme complexes. The ‘Functional Genes in Rumen Ciliate Protozoa’ section reports a wide range of protozoal fibrolytic enzymes, but does not establish that fungi and protozoa discharge different enzyme complexes. (LLM, conf=0.83)

  cites [64] Newbold, 2015, The role of ciliate protozoa in the rumen, Front Microbiol. sourceExperimental — accuracy not yet measured
• ?Not checked — no full text of the sourcecites [101] Puniya, 2015, Role of live microbial feed supplements with reference to anaerobic fungi in ruminant productivity: a review, J Integr Agric. source

In the paper

“These dietary lipids are usually enriched in polyunsaturated fatty acids (PUFA) (121), which can make complexes with bacterial cell walls and are considered toxic to gram-positive bacteria in the rumen (122).”

What the sources say

• Partly supported

  The Introduction and “Manipulating ruminal biohydrogenation” sections report that PUFA can be toxic to rumen microorganisms, particularly biohydrogenating bacteria. The passages do not say that PUFA form complexes with bacterial cell walls or specify toxicity to gram-positive bacteria. The dietary-PUFA statement is attached to a different citation (121). (LLM, conf=0.82)

  cites [121] Lourenco, 2010, The role of microbes in rumen lipolysis and biohydrogenation and their manipulation, Animal. sourceExperimental — accuracy not yet measured
• ?Not checked — no full text of the sourcecites [122] Kim, 2002, The enrichment of a ruminal bacterium (Megasphaera elsdenii YJ-4) that produces the trans-10, cis-12 isomer of conjugated linoleic acid, J Appl Microbiol. source

In the paper

“An in vitro study of Vargas et al. (141) shows that supplementation of vegetable oil (sunflower and linseed) at 6% in high-concentrate TMR has the potential to reduce CH4 emission (up to 21–28%), butyrate concentration, and A:P, while increasing propionate concentration.”

What the sources say

• Supported

  Split into 2 atoms — 2 confirmed, 0 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

  cites [141] Vargas, 2020, Dietary supplemental plant oils reduce methanogenesis from anaerobic microbial fermentation in the rumen, Sci Rep. source

In the paper

“The addition of CT extracts to the diet reduced populations of methanogenic archaea and some cellulolytic bacteria (R. flavefaciens) (201).”

What the sources say

• Partly supported

  The Discussion reports that incubating a basal diet with tannin sources containing both hydrolyzable and condensed tannins reduced methanogenic archaeal populations. It does not report a reduction in R. flavefaciens; the study measured total bacterial counts, which increased in one set of HT + CT incubations. Its findings are from in vitro incubation, not animals fed a diet. (LLM, conf=0.88)

  cites [201] Bhatta, 2009, Difference in the nature of tannins on in vitro ruminal methane and volatile fatty acid production and on methanogenic archaea and protozoal populations, J Dairy Sci. sourceExperimental — accuracy not yet measured

In the paper

“Furthermore, supplementation also increased the diversity and abundance of butyrate-producing and other beneficial bacteria (including probiotic species like Bifidobacterium and Lactobacillusamino), while enhancing the amino acid metabolic pathways and purine, pyrimidine, and sphingolipid metabolism (176).”

What the sources say

• Partly supported

  Split into 2 atoms — 0 confirmed, 2 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

  cites [176] Corrêa, 2020, Tannin supplementation modulates the composition and function of ruminal microbiome in lambs infected with gastrointestinal nematodes, FEMS Microbiol Ecol. sourceExperimental — accuracy not yet measured

In the paper

“Saponins reduce the protozoal population and some methanogens associated with protozoa, although their effect on methanogens does not always correlate with the effect on protozoa (31).”

What the sources say

• Partly supported

  The Results report that protozoal counts fell at higher saponin levels, and the Discussion says methanogens associated with protozoa also decrease. The Discussion does not say that effects on methanogens sometimes fail to correlate with effects on protozoa; its caveat instead concerns methanogen activity and methane emissions. It also notes that methanogen measures were not included in the meta-analysis (Discussion, Influence of addition levels; page unavailable). (LLM, conf=0.86)

  cites [31] Jayanegara, 2014, Meta-analysis on methane mitigating properties of saponin-rich sources in the rumen: influence of addition levels and plant sources, Asian-Australas J Anim Sci. sourceExperimental — accuracy not yet measured

In the paper

“Hederagenin bis-succinate (HBS) obtained by hydrolysis of ivy fruit extract has shown to shift fermentation toward propionate, attributed to its structural modifications that mediated the diversity of bacterial communities (167).”

What the sources say

• Partly supported

  The Methods describe hydrolyzing ivy fruit extract to obtain hederagenin, then synthesizing its bis-ester derivatives. Results Table 5 shows that hederagenin bis-succinate increased propionate's share of total volatile fatty acids after 24 hours of in vitro incubation. The paper does not establish that a change in bacterial-community diversity mediated this shift; the Discussion only suggests that other microorganisms may also have been affected. (LLM, conf=0.88)

  cites [167] Ramos-Morales, 2017, Antiprotozoal effect of saponins in the rumen can be enhanced by chemical modifications in their structure, Front Microbiol. sourceExperimental — accuracy not yet measured

In the paper

“Tannins can modify the ruminal microbiome, reduce protein degradation, decrease methanogenesis, and inhibit FA biohydrogenation (174, 175).”

What the sources say

• ?Not checked — no full text of the sourcecites [174] Patra, 2012, Dietary tannins on microbial ecology of the gastrointestinal tract in ruminants source
• Partly supported

  Section 6 (page not available) says low concentrations of condensed tannins protect proteins from microbial degradation in the rumen, supporting the protein-degradation part. It discusses changes in rumen fermentation, methane production, and fatty-acid biohydrogenation for secondary metabolites or tropical-tree feeds more broadly, but does not establish all three effects specifically for tannins. (LLM, conf=0.84)

  cites [175] Canul-Solis, 2020, Mitigation of rumen methane emissions with foliage and pods of tropical trees, Animals. sourceExperimental — accuracy not yet measured

In the paper

“As a subunit of HT, gallic acid has the potential to decrease the environmental impact of ruminants (by lowering CH4 and NH3 emissions) without decreasing animal performance (180).”

What the sources say

• Partly supported

  The Introduction identifies gallic acid as a component of hydrolyzable tannins, and the Methane Emission Measurement conclusion says it has potential to lower CH4 without reducing feed digestibility in beef cattle on a high-protein forage diet (page unavailable). But that conclusion says gallic acid may not reduce overall NH3 emissions from manure relative to the other tannins; it proposes N2O, not NH3, as the other emission it may lower. The paper reports feed intake and digestibility, not animal performance directly. (LLM, conf=0.90)

  cites [180] Aboagye, 2019, Use of gallic acid and hydrolyzable tannins to reduce methane emission and nitrogen excretion in beef cattle fed a diet containing alfalfa silage, J Anim Sci. sourceExperimental — accuracy not yet measured

In the paper

“However, studies have revealed that the activity of saponins fluctuates and even reduces during long-term studies (158), probably because of microbial adaptation (169).”

What the sources say

• ?Could not verify

  Citation (169) is attached to the proposed explanation, microbial adaptation. The Results and Discussion (p. 535) report that saponin addition did not alter the measured rumen microbial populations, but do not discuss adaptation or link it to declining activity over time. Searches for adaptation and long-term effects found no passage addressing that explanation. (LLM, conf=0.75)

  cites [158] Yuliana, 2019, Extracted saponin from sapindus rarak and hibiscus sp. As an additive in cassava leaf silage: effects on chemical composition, rumen fermentation and microbial population, Adv Anim Vet Sci. sourceExperimental — accuracy not yet measured
• ?Not checked — no full text of the sourcecites [169] Patra, 2012, Enteric methane mitigation technologies for ruminant livestock: a synthesis of current research and future directions, Environ Monitor Assess. source

In the paper

“According to Liu et al. (157), tea saponin did not affect methanogens and the total bacterial population including R. flavefaciens R. albus, and Butyrivibrio. However, protozoa were effectively reduced in response to tea saponins.”

What the sources say

• Partly supported

  Results §3.3 reports no change in methanogens, total bacteria, R. flavefaciens, R. albus, or B. fibrisolvens. It reports only a tendency for protozoa to decrease (p = 0.054), so “effectively reduced” overstates that finding. (LLM, conf=0.91)

  cites [157] Liu, 2019, Effects of tea saponin supplementation on nutrient digestibility, methanogenesis, and ruminal microbial flora in dorper crossbred ewe, Animals. sourceExperimental — accuracy not yet measured

In the paper

“It may be attributed to the fact that HT (e.g., gallic acid subunits) directly inhibit methanogens, but the action of CT on rumen CH4 production is variable (172, 207).”

What the sources say

• Partly supported

  Section 4.2.1 says hydrolysable tannins may act directly on methanogens, but emphasizes that the mechanism has not been definitively demonstrated. Section 4.2 also says gallic acid may have antimethanogenic effects; it does not establish that gallic acid directly inhibits methanogens. The Introduction supports the claim that condensed tannins have inconsistent effects on methane reduction. Page numbers were not supplied. (LLM, conf=0.88)

  cites [172] Aboagye, 2019, Potential of molecular weight and structure of tannins to reduce methane emissions from ruminants: a review, Animals. sourceExperimental — accuracy not yet measured
• ?Not checked — no full text of the sourcecites [207] Goel, 2012, Methane mitigation from ruminants using tannins and saponins, Trop Anim Health Prod. source

In the paper

“Dietary supplementation of oak tannin has also been shown to reduce the urinary N excretion by 12% while increasing α-linolenic acid content in milk by 17.7% without affecting CH4 production (190).”

What the sources say

• Supported

  The Abstract reports that oak tannin alone reduced urinary nitrogen excretion by 12% and increased milk α-linolenic acid by 17.7% in experiment 1. The Abstract and “Enteric CH₄ Production” section report no effect of oak tannin on daily methane production at the tested dose. These findings concern dairy cows fed a low-nitrogen diet containing linseed. (LLM, conf=0.94)

  cites [190] Focant, 2019, The effect of oak tannin (Quercus robur) and hops (Humulus lupulus) on dietary nitrogen efficiency, methane emission, and milk fatty acid composition of dairy cows fed a low-protein diet including linseed, J Dairy Sci. source

In the paper

“Tannin containing hay has been shown to reduce the CH4 emission (5.4 DM vs. 3.5 ml/g) and urea N excretion in beef cattle (187).”

What the sources say

• Partly supported

  The Abstract reports less urinary urea N in cows and heifers fed tannin-containing hays, and the Results and Conclusion report reduced methane yield for cows fed small burnet hay. The claimed 5.4 versus 3.5 ml/g comparison is not reported in the retrieved passages; the paper reports methane yield in g/kg of dry matter intake. Its methane finding is also conditional: heifers fed the same hay did not show reduced methane yield. (LLM, conf=0.90)

  cites [187] Stewart, 2019, Effect of tannin-containing hays on enteric methane emissions and nitrogen partitioning in beef cattle, J Anim Sci. sourceExperimental — accuracy not yet measured

In the paper

“Chestnut tannin possesses sufficient potential to reduce methanogenesis, without compromising feed efficiency and animal performance due to its neutral effect on NDF digestibility (177).”

What the sources say

• Supported

  The Conclusions (section 5) state that chestnut tannin did not decrease NDF degradability in this in vitro trial and suggest it could reduce methanogenesis without affecting diet efficiency or animal performance. The claim describes that potential, rather than asserting those animal outcomes were measured. (LLM, conf=0.91)

  cites [177] Mannelli, 2019, Effects of chestnut tannin extract, vescalagin and gallic acid on the dimethyl acetals profile and microbial community composition in rumen liquor: an in vitro study, Microorganisms. source

In the paper

“Tannins also possess antioxidant properties as they can scavenge free radicals due to hydroxyl groups, degree of polymerization, and redox activities (216–218).”

What the sources say

• ?Not checked — no full text of the sourcecites [216] Ariga, 1990, Radical scavenging action and its mode in procyanidins B-1 and B-3 from azuki beans to peroxyl radicals, Agri Biol Chem. source
• ?Not checked — no full text of the sourcecites [217] Ricci, 2016, Antioxidant activity of commercial food grade tannins exemplified in a wine model, Food Additiv Contaminants A source
• Partly supported

  The ‘Gaps in the literature and recommendation for future study’ section states that tannins have strong antioxidant activity. It does not attribute that activity to free-radical scavenging, hydroxyl groups, degree of polymerization, or redox activity. The ‘Effects of tannins on milk secretion’ section links hydroxyl groups to antimicrobial activity instead. Page numbers are unavailable in our copy. (LLM, conf=0.86)

  cites [218] Nawab, 2020, The potential effect of dietary tannins on enteric methane emission and ruminant production; as an alternative to antibiotic feed additives–a review, Annal Anim Sci sourceExperimental — accuracy not yet measured

In the paper

“Pomegranate as hydrolyzable tannin has shown better antioxidant activity as tested on cultured bovine aortic endothelial cells; it has no adverse effects on cell viability and apoptosis. Pomegranate has also exhibited protective effects against membrane lipid peroxidation, owing to its potent ability to reduce the production of intracellular reactive oxygen species (224).”

What the sources say

• Partly supported

  Split into 2 atoms — 1 confirmed, 1 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

  cites [224] Ciampi, 2020, Evaluation of natural plant extracts as antioxidants in a bovine in vitro model of oxidative stress, J Dairy Sci sourceExperimental — accuracy not yet measured

In the paper

“Recently, Garcia et al. (238) revealed that the chemical composition of EO, especially proportion of oxygenated compounds, has a positive interaction with fermentation pattern and indicate promising potential regarding CH4 mitigation.”

What the sources say

• Supported

  The Discussion links the fermentation effects of the two essential oils to their chemical composition, particularly the proportion of oxygenated compounds and its interaction with the incubation medium. The Conclusions report reduced methane production across substrates in vitro and identify the oils as candidates for further study, while noting that in vivo confirmation is needed. (LLM, conf=0.87)

  cites [238] Garcia, 2020, The reduction of methane production in the in vitro ruminal fermentation of different substrates is linked with the chemical composition of the essential oil, Animals. source

In the paper

“Supplementation of oregano EO at 4 and 7 g/d promoted the population of primary cellulolytic bacteria and ruminal fungi, respectively, in sheep (241).”

What the sources say

• Supported

  The Conclusions state that oregano essential oil increased the abundance of three primary cellulolytic bacteria at 4 g/d and ruminal fungi at 7 g/d. The Results and discussion likewise report greater abundances of the three bacterial species in sheep given 4 g/d and of fungi in sheep given 7 g/d. (LLM, conf=0.94)

  cites [241] Zhou, 2019, Effects of oregano essential oil on the ruminal pH and microbial population of sheep, PLoS ONE. source

In the paper

“Prolonged use of the purified form of secondary compounds can lead to antimicrobial resistance; however, tannin supplementation as a crude extract of mixtures (having different molecular sizes) offers a major advantage to control antimicrobial resistance (226).”

What the sources say

• Partly supported

  The Challenges section says prolonged use of purified plant compounds may lead to antimicrobial resistance and that complex tannin mixtures would reduce the likelihood of resistance. It also says little research has been done on this question, so the claim overstates a proposed advantage as an established way to control resistance. (LLM, conf=0.85)

  cites [226] Huang, 2018, Potential and challenges of tannins as an alternative to in-feed antibiotics for farm animal production, Anim Nutr. sourceExperimental — accuracy not yet measured

In the paper

“This shows the effective inhibitory effects of tannins on ruminal protein degradation and CH4 emission but requires careful selection of diets and nutrient composition to avoid adverse effects on feed digestibility and efficiency (229).”

What the sources say

• Partly supported

  The Tannins section (page unavailable) reports that tannin-containing diets can reduce enteric CH4, but says the effect varies and that high-tannin diets can harm production when dietary protein is limiting. The rumen-fermentation section (page unavailable) says condensed tannins bind plant proteins and interfere with protein digestion, but does not establish uniformly effective inhibition of ruminal protein degradation; it also reports increased proteolysis in some studies. The review supports careful diet formulation to avoid adverse effects, while the claim overstates the consistency of the inhibitory effects. (LLM, conf=0.82)

  cites [229] Min, 2020, Dietary mitigation of enteric methane emissions from ruminants: a review of plant tannins mitigation options, Anim Nutr sourceExperimental — accuracy not yet measured

In the paper

“Dietary supplementation of EO (coriander, geranyl acetate, and eugenol) reduced CH4 production up to 6% per cow/day and 20% less CH4 per kg of milk.”

What the sources say

• Supported

  The Introduction identifies coriander seed oil, geranyl acetate and eugenol as the additive’s main active compounds. The Conclusion reports 6% less methane per cow per day and 20% less per kg of milk in cows fed the additive versus controls, measured after the initial three weeks of the trial. (LLM, conf=0.94)

  cites [253] Hart, 2019, An essential oil blend decreases methane emissions and increases milk yield in dairy cows, Open J Anim Sci. source

In the paper

“A recent study has revealed that rumen microbial taxa (Bifidobacterium, Lactobacillus, and Schwartzia) exhibited a strong association with host antioxidant capacity and immunomodulatory functions (225).”

What the sources say

• Supported

  In “Change in ruminal bacterial communities” (page unavailable), Schwartzia correlates with antioxidant measures and Bifidobacterium correlates with the immune marker IFN-γ. The Discussion (page unavailable) also says Lactobacillus and Bifidobacterium correlate with IFN-γ. Together, these passages support the claim about the three taxa, although the reported associations differ by taxon. (LLM, conf=0.88)

  cites [225] Wang, 2020, Mining novel specific rumen bacteria to enhance the bioactive function of mulberry leaf in promoting host antioxidant activity and immunomodulatory, Researchsquare source

In the paper

“They are most effective against gram +ve bacteria and possess almost no activity against gram –ve (because of their hydrophilic bilayer) except thymol and carvacrol (232).”

What the sources say

• Partly supported

  Section 2.5 says Gram-positive bacteria are generally more sensitive to terpenes and explains how the hydrophilic surface of some Gram-negative bacteria can impede entry. But Section 2.2 reports that Gram-negative E. coli and Salmonella were inhibited by α-terpineol, linalool, and eucalyptol. The claim that Gram-negative bacteria have almost no susceptibility except to thymol and carvacrol overstates the source. (LLM, conf=0.90)

  cites [232] Zengin, 2014, Antibacterial and antioxidant activity of essential oil terpenes against pathogenic and spoilage-forming bacteria and cell structure-activity relationships evaluated by SEM microscopy, Molecules. sourceExperimental — accuracy not yet measured

In the paper

“It has been proposed that higher molecular weight compounds (such as polyphenols) were not dissolved well in water (263).”

What the sources say

• Partly supported

  Section 2.3 reports poor water solubility for some phenolics, including ellagic acid and potentially lignans. It does not say that higher molecular weight makes polyphenols poorly soluble in water; indeed, it says water solubility is usually not a major impediment for flavonoids. (LLM, conf=0.85)

  cites [263] Gao, 2010, Bioavailability challenges associated with development of anti-cancer phenolics, Mini Rev Med Chem. sourceExperimental — accuracy not yet measured

In the paper

“Essential oil–cobalt complexes have shown positive effects in ruminants by enhancing productive performance while decreasing NH3 emissions (233).”

What the sources say

• Partly supported

  The Results (Microbial metabolites and morphology in the goat rumen; page unavailable) report significantly increased average daily gain and reduced ruminal NH3-N production with EOC supplementation. The Conclusions suggest EOC could reduce ammonia emissions, but the reported measurement is ruminal ammonia production, not emissions. The claim overstates that part as an observed effect. (LLM, conf=0.85)

  cites [233] Lei, 2019, Ruminal metagenomic analyses of goat data reveals potential functional microbiota by supplementation with essential oil-cobalt complexes, BMC Microbiol. sourceExperimental — accuracy not yet measured

In the paper

“This is mainly because each EO possesses a complex mixture of phytochemicals and their synergistic effects can lead to the synthesis of new compounds with a quite different bioactivity that could not be harvested with individual compounds (29, 262).”

What the sources say

• ?Not checked — no full text of the sourcecites [29] Calsamiglia, 2007, Invited review: essential oils as modifiers of rumen microbial fermentation, J Dairy Sci. source
• Partly supported

  The methods passage (labelled Abstract in our copy; page unavailable) describes a defined blend containing thymol, eugenol, vanillin, and limonene, supporting the point that the preparation contains multiple compounds. The paper does not say that each essential oil has a complex phytochemical mixture or that interactions synthesize new compounds with bioactivity unattainable from individual compounds. (LLM, conf=0.84)

  cites [262] McIntosh, 2003, Effects of essential oils on ruminal microorganisms and their protein metabolism, Appl Environ Microbiol. sourceExperimental — accuracy not yet measured

In the paper

“This allows the penetration of the nanoparticles or nanoemulsion droplets to the microbial cells leading to enhanced activity (265, 266).”

What the sources say

• Partly supported

  The Discussion reports that catechin-containing near-nano and nano-sized green tea particles contribute to enhanced antimicrobial activity, and the Results report reduced antibacterial activity when smaller particles are removed. The paper does not say that the particles penetrate microbial cells or that penetration explains the activity; it also does not study nanoemulsion droplets. No page numbers are available in our copy. (LLM, conf=0.87)

  cites [265] Gopal, 2016, Bactericidal activity of green tea extracts: the importance of catechin containing nano particles, Sci Rep. sourceExperimental — accuracy not yet measured
• ?Not checked — no full text of the sourcecites [266] Li, 2015, A review: using nanoparticles to enhance absorption and bioavailability of phenolic phytochemicals, Food Hydrocolloids. source

In the paper

“Increased feed efficiency and calcium homeostasis have been observed with supplementation of a plant bioactive EO blend (>80% menthol, eugenol, and anethol).”

What the sources say

• Partly supported

  The Discussion reports significantly elevated feed efficiency and plasma calcium after supplementation with a blend containing more than 80% menthol plus smaller amounts of eugenol and anethol. The Conclusion says these effects *suggest* improved calcium homeostasis; it does not report calcium homeostasis itself as an observed outcome. (LLM, conf=0.85)

  cites [259] Braun, 2019, Dietary supplementation of essential oils in dairy cows: evidence for stimulatory effects on nutrient absorption, Animal. sourceExperimental — accuracy not yet measured

In the paper

“Some studies involving supplementation of EO in ruminants have shown contrary findings as the feeding of oregano EO did not reduce CH4 yield together with no effect on animal performance and rumen fermentation (240, 248).”

What the sources say

• Supported

  The Conclusions (page unavailable) state that, under the study conditions, oregano oil at 50 mg/kg of dietary dry matter did not affect methane production, ruminal fermentation, or milk production in dairy cows. This supports the cited claim of no reduction in methane yield and no effect on performance or rumen fermentation, within that dose and population. (LLM, conf=0.93)

  cites [240] Benchaar, 2020, Feeding oregano oil and its main component carvacrol does not affect ruminal fermentation, nutrient utilization, methane emissions, milk production, or milk fatty acid composition of dairy cows, J Dairy Sci. source
• Partly supported

  The Abstract reports no reduction in methane yield from dried oregano with high or low essential-oil content, and the Rumen Fermentation and milk-production results show no effects on those measures in the high-essential-oil experiment. But the cows were fed dried oregano plant material, not oregano essential oil itself. The low-essential-oil experiment also found changes in some rumen measures and milk yield, so the blanket statement of no effects is too broad. (LLM, conf=0.88)

  cites [248] Olijhoek, 2019, Effect of dried oregano (Origanum vulgare L.) plant material in feed on methane production, rumen fermentation, nutrient digestibility, and milk fatty acid composition in dairy cows, J Dairy Sci. sourceExperimental — accuracy not yet measured

In the paper

“Recently, Zhou et al. (239) suggested that oregano EO (52 mg/L) in mature ruminants can modify ruminal fermentation and mitigate in vitro CH4 production through mediating ruminal bacteria (Prevotella and Dialister).”

What the sources say

• Partly supported

  The Effects on Total Gas and Methane Production section reports reduced in vitro methane with increasing oregano essential oil, and the Rumen Microbial Community section reports increased Prevotella and Dialister. The Conclusions propose 52 mg/L for future studies in mature ruminants, not as a demonstrated in vivo effect. The paper does not establish that changes in those two bacteria mediate methane reduction; it says the exact mechanism remains unknown and suggests methane may be more influenced by archaea. (LLM, conf=0.85)

  cites [239] Zhou, 2020, Effects of oregano essential oil on in vitro ruminal fermentation, methane production, and ruminal microbial community, J Dairy Sci. sourceExperimental — accuracy not yet measured

In the paper

“Recently, a meta-analysis showed that dietary supplementation of a blend of EO (coriander, eugenol, and geraniol) increased the milk yield (3.6%), milk fat and protein (4.1%), and feed efficiency (4.4%), while decreasing DM intake (12.9%) and CH4 production (8.8%) during long term trial in dairy cattle (258).”

What the sources say

• Partly supported

  Split into 2 atoms — 1 confirmed, 1 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

  cites [258] Belanche, 2020, A meta-analysis describing the effects of the essential oils blend agolin ruminant on performance, rumen fermentation and methane emissions in dairy cows, Animals. sourceExperimental — accuracy not yet measured

In the paper

“Maximizing the flow of metabolic hydrogen in the rumen away from CH4 and toward volatile fatty acids (VFA) would increase the efficiency of ruminant production and decrease its environmental impact.”

• Also stated in: § Introduction · hedged

  “Maximizing the flow of metabolic hydrogen ([H]) in the rumen away from CH4 and toward VFA would increase the efficiency of ruminant production and decrease its environmental impact.”

In the paper

“Methanogenesis occurs both in the rumen and hindgut, but 90% of the total CH4 production originates from the rumen (21).”

What the sources say

• ?Not checked — no full text of the sourcecites [21] Kumar, 2014, New aspects and strategies for methane mitigation from ruminants, Appl Microbiol Biotechnol. source

In the paper

“Production of CH4 also deprives the host animal of carbon resources and results in loss of energy (13.3 Mcal/kg CH4), leading to poor feed efficiency (9).”

What the sources say

• ?Not checked — no full text of the sourcecites [9] Johnson, 1995, Methane emissions from cattle, J Anim Sci. source

In the paper

“Total VFA (75% of total amount) are the primary source of energy for the animal (2).”

What the sources say

• ?Not checked — no full text of the sourcecites [2] Bergman, 1990, Energy contributions of volatile fatty acids from the gastrointestinal tract in various species, Physiol Rev. source

In the paper

“The association of VFA composition with rumen bacteria has been reported in dairy cows possessing different efficiencies of production (15).”

What the sources say

• ?Not checked — no full text of the sourcecites [15] Hernandez-Sanabria, 2010, Correlation of particular bacterial PCR-denaturing gradient gel electrophoresis patterns with bovine ruminal fermentation parameters and feed efficiency traits, Appl Environ Microbiol. source

In the paper

“Plant secondary metabolites usually enhance the permeability and fluidity of the cellular membranes, further causing an efflux of metabolites and ions and ultimately leading to cell leakage and microbial death.”

What the sources say

• ?Not checked — no full text of the sourcecites [78] Patra, 2019, Modulation of gastrointestinal barrier and nutrient transport function in farm animals by natural plant bioactive compounds–a comprehensive review, Crit Rev Food Sci Nutr. source
• ?Not matched

  Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  cites [79] Mechanisms of antimicrobial actions of phytochemicals against enteric pathogens–a review7785 Omojate GodstimeC Enwa FelixO Jewo AugustinaO Eze ChristopherO J Pharm Chem Biol Sci.22014

In the paper

“A recent meta-analysis showed that feeding high-forage diets (>40% DM) reduced milk production (0.087 L/d) and milk lactose content (0.065 g/100 g) compared to high-concentrate diets (>40% DM) in sheep. However, fat content and conjugated linoleic acid concentrations were higher in the high-forage group (119).”

What the sources say

• ?Not checked — no full text of the sourcecites [119] Hernández, 2020, Effect of forage to concentrate ratio and fat supplementation on milk composition in dairy sheep: a meta-analysis, Livestock Sci. source

In the paper

“Feeding of alfalfa silage increased the relative abundance of F. succinogenes and R. flavefaciens while reducing CH4 production in the cow rumen as compared to sweet sorghum silage.”

What the sources say

• ?Not checked — no full text of the sourcecites [115] Chen, 2019, Ensiling characteristics, in vitro rumen fermentation, microbial communities and aerobic stability of low-dry matter silages produced with sweet sorghum and alfalfa mixtures, J Sci Food Agric. source

In the paper

“Feeding concentrate diets have shown to lower the ruminal pH, increase VFA concentrations and osmolality, and induce metabolic disorders (105).”

What the sources say

• ?Not checked — no full text of the sourcecites [105] DeVries, 2014, Impact of severity of ruminal acidosis on feed-sorting behaviour of beef cattle, Anim Prod Sci. source

In the paper

“Plant oils can mitigate CH4 by directly inhibiting rumen protozoa and methanogens and increasing the biohydrogenation of PUFA to act as a sink for hydrogen produced by rumen microbes (136).”

What the sources say

• ?Not checked — no full text of the sourcecites [136] Wang, 2017, Effect of unconventional oilseeds (safflower, poppy, hemp, camelina) on in vitro ruminal methane production and fermentation, J Sci Food Agric. source

In the paper

“This is mainly because the enhanced expression of some methanogenic genes may lead to enhanced methanogenesis that ultimately compensated a decrease in the overall number of methanogens (156).”

What the sources say

• ?Not checked — no full text of the sourcecites [156] Henderson, 2018, Enzyme-and gene-based approaches for developing methanogen-specific compounds to control ruminant methane emissions: a review, Anim Prod Sci. source

In the paper

“They can limit the degree of microbial hydrolysis along with direct inhibition of methanogens.”

In the paper

“This suggests that the impacts of tea saponins under in vitro conditions must be confirmed in vivo to develop effective CH4-mitigating strategies.”

In the paper

“Supplementation of tannic acid has shown to reduce the CP digestibility and CH4 production in beef cattle (198).”

What the sources say

• ?Not checked — no full text of the sourcecites [198] Yang, 2017, Effects of dietary supplementing tannic acid in the ration of beef cattle on rumen fermentation, methane emission, microbial flora and nutrient digestibility, J Anim Physiol Anim Nutr. source

In the paper

“Studies have shown that a combination of garlic oil, nitrate, and saponins can additively lower CH4 emission with similar rumen fermentation and degradability (163).”

What the sources say

• ?Not checked — no full text of the sourcecites [163] Patra, 2015, Effects of garlic oil, nitrate, saponin and their combinations supplemented to different substrates on in vitro fermentation, ruminal methanogenesis, and abundance and diversity of microbial populations, J Appl Microbiol. source

In the paper

“Saponins mediate rumen fermentation mainly by decreasing protein degradation and concentrations of urea and NH3 in the rumen, leading to an increased flow of amino acids to the small intestine.”

In the paper

“Extracts of S. sesban have shown to decrease protozoal and methanogen populations but surprisingly did not decrease CH4 production (155).”

What the sources say

• ?Not checked — no full text of the sourcecites [155] Goel, 2008, Effects of Sesbania sesban and Carduus pycnocephalus leaves and Fenugreek (Trigonella foenum-graecum L.) seeds and their extracts on partitioning of nutrients from roughage-and concentrate-based feeds to methane, Anim Feed Sci Technol. source

In the paper

“Condensed tannins have shown better protein efficiency and growth rate of lambs as it can protect dietary proteins (e.g., soybean meal) from ruminal degradation, leading to reduction in digestive losses (204).”

What the sources say

• ?Not checked — no full text of the sourcecites [204] Dentinho, 2020, Effect of soybean meal treatment with Cistus ladanifer condensed tannins in growth performance, carcass and meat quality of lambs, Livestock Sci. source

In the paper

“In this regard, it has been reported that supplementation of quebracho tannins (30 g/kg DM) could reduce myristic acid content in dairy cows, which reveals the negative effects of tannin on fiber digestibility (214).”

What the sources say

• ?Not checked — no full text of the sourcecites [214] Henke, 2017, Effect of dietary Quebracho tannin extract on feed intake, digestibility, excretion of urinary purine derivatives and milk production in dairy cows, Archiv Anim Nutr. source

In the paper

“Hydrolyzable tannins are considered the most potent antioxidants, which can prevent cellular damage and neutralize free radicals (222), while condensed tannins (catechin) also possess antioxidant activities (223).”

What the sources say

• ?Not checked — no full text of the sourcecites [222] Chambi, 2013, Antioxidant potential of hydrolyzed polyphenolic extracts from tara (Caesalpinia spinosa) pods, Indus Crops Product. source
• ?Not checked — no full text of the sourcecites [223] Anggraini, 2011, Antioxidative activity and catechin content of four kinds of Uncaria gambir extracts from West Sumatra, Indonesia, African J Biochem Res. source

In the paper

“However, long-chain FA (pentadecanoic and heptadecanoic acid) exhibited a negative correlation with CH4 emission as their de novo synthesis is mediated from ruminal propionate (215).”

What the sources say

• ?Not checked — no full text of the sourcecites [215] French, 2012, Rumen and milk odd-and branched-chain fatty acid proportions are minimally influenced by ruminal volatile fatty acid infusions, J Dairy Sci. source

In the paper

“The medium-chain FA (lauric and myristic acids) have shown a positive correlation with enteric CH4 production as these FA are synthesized (de novo synthesis) in the mammary gland from ruminal acetate and butyrate (213).”

What the sources say

• ?Not checked — no full text of the sourcecites [213] Bernard, 2008, Expression and nutritional regulation of lipogenic genes in the ruminant lactating mammary gland source

In the paper

“A recent study showed that gallic acid can inhibit undesirable microorganisms such as Clostridium, Listeria, and Escherichia coli during ensiling and can improve fermentation quality and protein preservation (203).”

What the sources say

• ?Not checked — no full text of the sourcecites [203] He, 2020, Gallic acid influencing fermentation quality, nitrogen distribution and bacterial community of high-moisture mulberry leaves and stylo silage, Bioresource Technol. source

In the paper

“Supplementation of tannin has been shown to improve the antioxidant status of cattle and sheep (219–221).”

What the sources say

• ?Not checked — no full text of the sourcecites [219] Barreira, 2008, Antioxidant activities of the extracts from chestnut flower, leaf, skins and fruit, Food Chem. source
• ?Not checked — no full text of the sourcecites [220] Huang, 2015, Effects of purple prairie clover (Dalea purpurea Vent.) on feed intake, nutrient digestibility and faecal shedding of Escherichia coli O157: H7 in lambs, Anim Feed Sci Technol. source
• ?Not checked — no full text of the sourcecites [221] Peng, 2016, Effect of purple prairie clover (Dalea purpurea Vent.) hay and its condensed tannins on growth performance, wool growth, nutrient digestibility, blood metabolites and ruminal fermentation in lambs fed total mixed rations, Anim Feed Sci Technol. source

In the paper

“A meta-analysis showed reduction in ruminal ammonia N (16%), milk urea (9%), and urinary N excretion (11%) in response to supplementation of tannin in lactating dairy cows.”

What the sources say

• ?Not checked — no full text of the sourcecites [211] Herremans, 2020, Effect of dietary tannins on milk yield and composition, nitrogen partitioning and nitrogen use efficiency of lactating dairy cows: a meta-analysis, J Anim Physiol Anim Nutr. source

In the paper

“Tannic acid (0–1.25 mg/mL) can alter microbial activities and improve feed efficiency in ruminants.”

What the sources say

• ?Not checked — no full text of the sourcecites [206] Cipriano-Salazar, 2018, Antibacterial activities of tannic acid against isolated ruminal bacteria from sheep, Microb Pathogenesis. source

In the paper

“Extracts of HT (tara) and CT (mimosa and gambier) inhibited the activity of methanogens and protozoa without affecting ruminal fermentation and animal production (185).”

What the sources say

• ?Not checked — no full text of the sourcecites [185] Salami, 2018, Characterisation of the ruminal fermentation and microbiome in lambs supplemented with hydrolysable and condensed tannins, FEMS Microbiol Ecol. source

In the paper

“Many in vitro and in vivo trials have proved the favorable effect of EO in reducing CH4 production and altering microbial populations (Tables 5, 6).”

What the sources say

• ?Not matched

  Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  cites Tables 5, 6

In the paper

“Higher microbial protein might be attributed to the enhanced post-ruminal protein supply and absorption.”

In the paper

“Moreover, it might possibly due to the reduction of protozoal counts as ruminal protozoa devour many bacteria and their protein flow toward the small intestine (237).”

What the sources say

• ?Not checked — no full text of the sourcecites [237] Soltan, 2018, Progressive adaptation of sheep to a microencapsulated blend of essential oils: ruminal fermentation, methane emission, nutrient digestibility, and microbial protein synthesis, Anim Feed SciTechnol. source

In the paper

“These harmful effects might be due to their extensive and non-specific antimicrobial properties in the rumen.”

In the paper

“Supplementing a blend of EO (cinnamaldehyde, eugenol, carvacrol, and capsicum oleoresin) firstly increased rumen acetate concentration, which was replaced by propionate concentration afterward.”

What the sources say

• ?Not checked — no full text of the sourcecites [237] Soltan, 2018, Progressive adaptation of sheep to a microencapsulated blend of essential oils: ruminal fermentation, methane emission, nutrient digestibility, and microbial protein synthesis, Anim Feed SciTechnol. source

In the paper

“Extensive literature supports the supplementation of phytogenic feed additives like saponin, tannins, and EO for the manipulation of rumen microbiome to modulate ruminal fermentation to increase VFA and decrease NH3 and CH4 production.”

In the paper

“Essential oils of Lippia turbinata and Tagetes minuta have shown a 10-fold decrease of in vitro CH4 production coupled with modification of N metabolism in the rumen (249).”

What the sources say

• ?Not checked — no full text of the sourcecites [249] Garcia, 2019, Essential oils from Lippia turbinata and Tagetes minuta persistently reduce in vitro ruminal methane production in a continuous-culture system, Anim Prod Sci. source

In the paper

“Moreover, the benefits of such a combination are its ultimate utility for using on large scale in the animal industry as a commercial feed additive to have an overall impact on the improvement of global animal production while mitigating GHG emissions.”

In the paper

“Studies summarized above clearly demonstrate that although phytochemicals possess a potent ability to modulate rumen microbiome and reduce methanogenesis in vitro, the observed in vivo effects varied greatly.”

In the paper

“Nanoparticles are formulated with hydrophobic groups inside and polar groups on the surface of particles and have shown to significantly enhance the solubility and bioavailability of less-water-soluble phenolic phytochemicals (264).”

What the sources say

• ?Not checked — no full text of the sourcecites [264] Li, 2014, Fabrication of self-assembled ()-epigallocatechin gallate (EGCG) ovalbuminedextran conjugate nanoparticles and their transport across monolayers of human intestinal epithelial Caco-2 cells, J Agri Food Chem. source

In the paper

“Additionally, using a combination of phytochemicals is also advantageous for the host regarding the provision of various phytonutrients from different plant combinations.”