NDLI: Potential for Reducing On-Farm Greenhouse Gas and Ammonia Emissions from Dairy Cows with Prolonged Dietary Tannin Additions

Content Provider	Springer Nature Link
Author	Duval, Benjamin D. Aguerre, Matias Wattiaux, Michel Vadas, Peter A. Powell, J. Mark
Copyright Year	2016
Abstract	Dairy cows are responsible for significant emissions of enteric methane (CH$_{4}$) and produce nitrous oxide (N$_{2}$O) and ammonia (NH$_{3}$) gas from manure. As an abatement strategy, we explored the effects of long-term condensed tannin (Quebracho and chestnut extracts) addition to dairy cow diets. Previous studies have demonstrated that tannins in cow diets reduce methane and ammonia efflux, but none have done so over a >1-month time period. A modified stanchion barn equipped with gas analysis instrumentation measured CH$_{4}$, N$_{2}$O, and NH$_{3}$ fluxes into and from the barn, at the onset of the experiment, and 45 and 90 days after feeding groups of lactating dairy cows a control diet or two levels of tannin extract at 0.45 and 1.8 % of dietary dry matter. Few statistical differences among treatments were observed, likely a consequence of high variability and low sample size necessary for conducting a study of this duration. However, on a per-cow basis, low and high tannin diets lowered CH$_{4}$ emissions by 56 g cow$^{−1}$ day$^{−1}$ and by 48 g cow day$^{−1}$, respectively. Diet tannin additions lowered CH$_{4}$ (33 %), NH$_{3}$ (23 %), and N$_{2}$O (70 %) per unit milk corrected emissions in the high tannin treatment compared to the control at the end of the experiment, without significant loss in milk production. These results suggest that relatively low concentrations of diet tannin additions can reduce ruminant CH$_{4}$ and gaseous N emissions from manure. The tannin effect observed after 90 days is a starting point for considering tannin additions as a potential long-term strategy for improving the environmental footprint of milk production.
Starting Page	1
Ending Page	10
Page Count	10
File Format	PDF
ISSN	00496979
Journal	Water, Air, and Soil Pollution
Volume Number	227
Issue Number	9
e-ISSN	15732932
Language	English
Publisher	Springer International Publishing
Publisher Date	2016-08-13
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ammonia Condensed tannin Dairy cows Greenhouse gas flux Methane Nitrous oxide Environment Water Quality/Water Pollution Atmospheric Protection/Air Quality Control/Air Pollution Soil Science & Conservation Hydrogeology Climate Change/Climate Change Impacts
Content Type	Text
Resource Type	Article
Subject	Ecological Modeling Environmental Chemistry Pollution Environmental Engineering Water Science and Technology

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