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Inclusion of a tannin-rich legume in the diet of beef steers reduces greenhouse gas emissions from their excreta
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Inclusion of a tannin-rich legume in the diet of beef steers reduces greenhouse gas emissions from their excreta
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Journal Article
Inclusion of a tannin-rich legume in the diet of beef steers reduces greenhouse gas emissions from their excreta
2022
Overview
The objectives of this study were to determine the emission of nitrous oxide (N
2
O), methane (CH
4
), and carbon dioxide (CO
2
), as well as the isotopic composition of N
2
O from excreta of beef steers fed ‘AU Grazer’ sericea lespedeza hay [SL;
Lespedeza cuneata
(Dum. Cours.) G. Don]. Fifteen Brahman × Angus crossbred steers were fed one of three experimental diets: 0, 50, or 100% inclusion of SL into ‘Tifton 85’ bermudagrass hay (
Cynodon
spp.). Gas sampling occurred on days 0, 1, 3, 5, 7, 14, 18, 25, and 32 after urine or feces application to static chambers for two experimental periods. Effect of the day after feces application (
P
< 0.001), while day × inclusion of SL interaction was observed in urine (
P
< 0.001) for all greenhouse gases (GHG) analyzed. Peaks of emission of all GHG in urine and feces occurred in the first days (
P
< 0.001), with days 3 and 5 being most depleted in
15
N-N
2
O in feces, and days 3, 5, and 7, in urine (
P
< 0.001). Feeding SL to beef steers was effective in mitigating the emission of GHG from the excreta, but further research is necessary to investigate the mechanisms behind the reductions.
