Effect of dietary tannins on milk yield and composition, nitrogen partitioning and nitrogen use efficiency of lactating dairy cows: a meta-analysis
Abstract
Tannins are secondary plant compounds which have been extensively studied in order to improve the nitrogen use efficiency (NUE) of ruminants. A meta-analysis was performed of 58 in vivo experiments comparing milk yield, composition and nitrogen metabolism of lactating dairy cows fed diets with or without tannins. The meta-analysis shows that tannins have no impact on corrected milk yield, fat and protein content or NUE (p > .05). However, tannins reduce ruminal ammoniacal nitrogen (N) production by 16% (from 10.95 to 8.47 mg/dl on average), milk urea by 9% (from 15.82 to 14.03 mg/dl) and urinary N excretion (-11%; p < .05). This is compensated for by a lower apparent N digestibility (61.51% with dietary tannins compared to 66.17% without). The effect of tannin on N metabolism parameters increases with tannin dose (p < .05). The shift from urinary to faecal N may be beneficial for environment preservation, as urinary N induces more harmful emissions than faecal N. From a farmer's perspective, tannins seem unable to increase fat- and protein-corrected milk yield or reduce feed protein requirements and thus have no direct economic benefit. Potentially less costly than tannin extracts, forage or by-products naturally rich in tannins could still be useful to reduce the environmental impact of ruminant protein feeding.
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Tannin supplementation has no effect on fat- and protein-corrected milk yield in lactating dairy cows.
“However, tannin exhibited no effect on fat- and protein-corrected milk yield (211).”
From Phytogenic Additives Can Modulate Rumen Microbiome to Mediate Fermentation Kinetics and Methanogenesis Through Exploiting Diet–Microbe Interaction (2020) · cites this paper as [211]
Supplementation of tannin in lactating dairy cows reduces ruminal ammonia N by 16%, milk urea by 9%, and urinary N excretion by 11%.
“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.”
From Phytogenic Additives Can Modulate Rumen Microbiome to Mediate Fermentation Kinetics and Methanogenesis Through Exploiting Diet–Microbe Interaction (2020) · cites this paper as [211]
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Hassan, F.-U., Arshad, M. A., Ebeid, H. M., Rehman, M. S.-U., Khan, M. S., Shahid, S., & Yang, C. (2020) · Frontiers in Veterinary Science · doi:10.3389/fvets.2020.575801 · Cited by 160 · see citing works
- Authors
- Herremans, S., Vanwindekens, F., Decruyenaere, V., Beckers, Y., & Froidmont, E.
- Affiliations
- Walloon Agricultural Research Centre (BE)
- University of Liège (BE)
- Production and Sectors Department Walloon Agricultural Research Center Gembloux Belgium
- Corresponding author
- Herremans, Sophie
- Venue
- Journal of Animal Physiology and Animal Nutrition
- Publisher
- Wiley
- Published
- 2020-03-12
- Volume
- 104
- Issue
- 5
- Pages
- 1209-1218
- ISSN
- 0931-2439 (ISSN-L)
- 1439-0396
- OpenAlex
- W3012130188
- Cited by
- 73
- References
- 71
- Citations by year
- 2026: 12 · 2025: 14 · 2024: 11 · 2023: 19 · 2022: 8 · 2021: 7 · 2020: 2
- FWCI
- 1.22
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Animal Physiology and Animal Nutrition (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Agricultural and Biological Sciences › Agronomy and Crop Science › Ruminant Nutrition and Digestive Physiology
- Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Animal Nutrition and Physiology
- Life Sciences › Agricultural and Biological Sciences › Agronomy and Crop Science › Milk Quality and Mastitis in Dairy Cows
- Keywords
- dietary tannins, nitrogen use efficiency, nitrogen partitioning, lactating dairy cows, milk yield, milk composition, rumen ammonia, milk urea nitrogen, urinary nitrogen excretion, apparent nitrogen digestibility, environmental impact of livestock
- MeSH terms
- Animals, Animal Feed, Animal Nutritional Physiological Phenomena, Cattle, Diet, Female, Lactation, Milk, Nitrogen, Tannins
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