Supplementation of Acacia mearnsii tannins decreases methanogenesis and urinary nitrogen in forage-fed sheep
Supplementation of Acacia mearnsii tannins decreases methanogenesis and urinary nitrogen in forage-fed sheep
复制标题
DOI：
10.1071/ar05022
复制
发表时间：
2005-01-01
影响因子：
--
通讯作者：
Hess, HD
中科院分区：
文献类型：
--
作者：
Carulla, JE;Kreuzer, M;Hess, HD
本实验的目的是使用呼吸室技术，评估用红三叶草（红三叶）或苜蓿（苜蓿）补充0或41 g黑荆提取物（含有0.615 g/g缩合单宁）/kg膳食干物质部分替代黑麦草（多年生黑麦草）对绵羊氮周转和甲烷释放的影响。在所有变量中，基础饮食和单宁补充之间没有显着的相互作用。豆科植物部分取代了草，但对通过粪便或尿液排出的氮量没有影响。与单种黑麦草相比，混播苜蓿的氮和能量利用率显著降低（P < 0.05），混播红三叶草的甲烷释放量（kJ/MJ）显著增加（P < 0.05）。添加单宁显著降低了瘤胃氨浓度和尿氮排泄量（P < 0.05），但不影响体氮和能量沉积，并使甲烷释放量平均降低13%（P < 0.001）。结果表明，补充黑荆树单宁可以是有用的，在减轻甲烷和潜在的气态氮的排放，而豆科植物取代草显然没有显示出在这方面的优势。
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.