Supplementation of Acacia mearnsii tannins decreases methanogenesis and urinary nitrogen in forage-fed sheep

被引:325
作者
Carulla, JE
Kreuzer, M
Machmüller, A
Hess, HD [1 ]
机构
[1] Swiss Fed Inst Technol, ETH Ctr LFW, Inst Anim Sci, CH-8092 Zurich, Switzerland
[2] Univ Nacl Colombia, Dept Anim Prod, Bogota, Colombia
来源
AUSTRALIAN JOURNAL OF AGRICULTURAL RESEARCH | 2005年 / 56卷 / 09期
关键词
energy expenditure; feed additives; grass-legume associations; lucerne; ruminant;
D O I
10.1071/AR05022
中图分类号
S [农业科学];
学科分类号
09 ;
摘要
The objective of this experiment was to assess the effects of a partial replacement of ryegrass (Lolium perenne) by red clover (Trifolium pratense) or alfalfa (Medicago sativa) supplemented with 0 or 41 g Acacia mearnsii extract (containing 0.615 g/g condensed tannins)/kg dietary dry matter on nitrogen turnover and methane release by sheep, using the respiration chamber technique. Across all variables, there was no significant interaction between basal diet and tannin supplementation. The partial replacement of the grass by the legumes remained without effect on the amounts of nitrogen excreted through faeces or urine. Nitrogen and energy utilisation was lower ( P < 0.05) with ryegrass-alfalfa than with ryegrass alone, and methane release (kJ/MJ gross energy intake) was higher (P < 0.05) with ryegrass-red clover than with ryegrass alone. Tannin supplementation decreased (P < 0.05) ruminal ammonia concentration and urinary nitrogen excretion without affecting body nitrogen and energy retention, and reduced (P < 0.001) methane release by 13% on average. The results suggest that supplemented Acacia mearnsii tannins can be useful in mitigating methane and potential gaseous nitrogen emissions, whereas a replacement of grass by legumes obviously shows no advantage in this respect.
引用
收藏
页码:961 / 970
页数:10
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