Cited by 74Ruminant Nutrition and Digestive PhysiologyMilk Quality and Mastitis in Dairy CowsAnimal Nutrition and Physiology

Alterations in ruminal bacterial populations at induction and recovery from diet-induced milk fat depression in dairy cows

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Pitta, D.W., Indugu, N., Vecchiarelli, B., Rico, D.E., Harvatine, K.J.·2018·Journal of Dairy Science

Abstract

Ten ruminally cannulated Holstein cows were used in a crossover design that investigated changes in ruminal bacterial populations in response to induction and recovery from diet-induced milk fat depression (MFD). Further, the effect on the ruminal microbiota of the cows with diet-induced milk fat depression inoculated with rumen contents from non-milk fat-depressed donor cows was evaluated. Milk fat depression was induced during the first 10 d of each period by feeding a low-fiber, high-starch, and high-polyunsaturated fatty acid diet (26.1% neutral detergent fiber, 28.1% starch, 5.8% total fatty acids, and 1.9% C18:2), resulting in a 30% decrease in milk fat yield. Induction was followed by a recovery phase, where all cows were switched to a high-fiber, low-starch, and low-polyunsaturated fatty acid diet (31.8% neutral detergent fiber, 23% starch, 4.2% total fatty acids, and 1.2% C18:2) and were allocated to (1) control (no inoculation) or (2) ruminal inoculation with donor cow digesta (8 kg/d for 6 d). Ruminal samples were collected at the end of induction (d 10) and during recovery (d 13, 16, and 28), separated to solid and liquid fractions, extracted for DNA, PCR- amplified for the V1-V2 region of the 16S rRNA gene, and analyzed for bacterial diversity. Results indicated that bacterial communities were different between fractions. In each fraction, differences were significant between the induction (d 10) and recovery (d 13, 16, and 28) periods; however, differences were less apparent with time during the recovery period. The MFD (d 10) was typified by a reduction in the relative sequence abundance of Bacteroidetes and an increase in the relative sequence abundance of Firmicutes and Actinobacteria across both fractions. At the genus level, relative sequence abundance of unclassified Lachnospiraceae, Butyrivibrio, Bulleidia, and Coriobacteriaceae were higher on d 10 and were positively correlated with trans-10,cis-12 CLA and the trans-10 isomer, suggesting their potential role in altered biohydrogenation reactions. A switch to the recovery diet resulted in a sharp increase in the Bacteroidetes lineages and a decrease in Firmicutes members on d 13; however, this shift appears to stabilize by d 28, indicating the restoration process for ruminal bacteria from an altered state is gradual and complex. Inoculation of 10% of rumen contents from non-MFD donor cows to MFD cows revealed this procedure had transient effects on only a few bacterial populations, and such effects disappeared after d 16 following cessation of inoculation. It can be concluded that alterations in milk FA profiles at induction are preceded by microbial alterations in the rumen driven by dietary changes.

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  • The diet fed to ruminants is the primary determinant of bacterial community structure.

    “The diet fed to ruminants is the primary determinant of bacterial community structure (95–97).”

    From Phytogenic Additives Can Modulate Rumen Microbiome to Mediate Fermentation Kinetics and Methanogenesis Through Exploiting Diet–Microbe Interaction (2020) · cites this paper as [97]

    The Introduction (page unavailable) says changes in dietary components can significantly alter rumen microbial communities, and the Discussion (page unavailable) reports that dietary modifications significantly altered bacterial community composition in the studied dairy cows. The paper does not establish that diet is the primary determinant relative to other factors, or that this ranking applies to ruminants generally. (LLM, conf=0.85)

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Research works printed but not linked: 1

  1. Garton, G. A. 1977. Fatty acid metabolism in ruminants. Page 337- 370 in Biochemistry of Lipids II. T. W. Goodwin, ed. Univ. Park Press, Baltimore, MD.

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Authors
Pitta, D. W., Indugu, N., Vecchiarelli, B., Rico, D. E., & Harvatine, K. J.
Affiliations
  • University of Pennsylvania (US)
  • Centre de Recherche en Sciences Animales de Deschambault (CA)
  • Pennsylvania State University (US)
Corresponding author
Pitta, D.W.
Venue
Journal of Dairy Science
Published
2018-01
Volume
101
Issue
1
Pages
295-309
ISSN
0022-0302 (ISSN-L)
OpenAlex
W2765996011
Cited by
73
References
52
Citations by year
2026: 3 · 2025: 6 · 2024: 19 · 2023: 6 · 2022: 5 · 2021: 6 · 2020: 12 · 2019: 11 · 2018: 5
FWCI
13.30
Type
journal article
Language
en
Open access
Locations
  • Journal of Dairy Science (publishedVersion)
  • PubMed (publishedVersion)
Funders
University of Pennsylvania
Topics
  • Life Sciences › Agricultural and Biological Sciences › Agronomy and Crop Science › Ruminant Nutrition and Digestive Physiology
  • Life Sciences › Agricultural and Biological Sciences › Agronomy and Crop Science › Milk Quality and Mastitis in Dairy Cows
  • Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Animal Nutrition and Physiology
Keywords
milk fat depression, rumen microbiota, dairy cattle, rumen inoculation, high-fiber diet, polyunsaturated fatty acids, trans-10, cis-12 CLA, biohydrogenation, Butyrivibrio, Lachnospiraceae, Bacteroidetes, Firmicutes
MeSH terms
Animals, Animal Feed, Animal Nutritional Physiological Phenomena, Bacteria, Cattle, Diet, Dietary Fiber, Female, Lactation, Milk, RNA, Ribosomal, 16S, Rumen

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