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Long-term effects of ensiled cornstalk diet on methane emission, rumen fermentation, methanogenesis and weight gain in sheep

文献类型：外文期刊

作者： Liu, C. ¹ ; Zhu, Z. P. ¹ ; Shang, B. ¹ ; Chen, Y. X. ¹ ; Guo, T. J. ² ; Luo, Y. M. ² ;

作者机构： 1.Chinese Acad Agr Sci, Inst Environm & Sustainable Dev Agr, Beijing 100193, Peoples R China

2.Xinjiang Acad Anim Sci, Feed Res Inst, Urumqi, Peoples R China

关键词： Sheep;Ensiled cornstalk;Methane;VFA;Methanogen abundance

期刊名称：SMALL RUMINANT RESEARCH （影响因子：1.611；五年影响因子：1.813 ）

ISSN： 0921-4488

年卷期： 2013 年 115 卷 1-3 期

页码：

收录情况： SCI

摘要： The objective of this study was to compare the long-term effects of diets rich in either ensiled or dry cornstalk at different concentrate-to-forage ratios on the methane production from sheep. A total of fifty-nine sheep (male, 25.06 +/- 0.39 kg live weight at the beginning) were randomly divided into four groups with four diet treatments as follows: ensiled cornstalk diet at 40% (CSH) and 20% (CSL) concentrate level, dry cornstalk diet at 40% (DSH) and 20% (DSL) concentrate level. At different concentrate levels, the sheep fed ensiled cornstalk diet produced a lower methane output (L/d or L/kg DM) than the sheep fed dry cornstalk diet, and the difference was significant when 20% concentrate was added in the diet (P<0.05). For the rumen fluid analysis, the VFAs concentration showed no difference between four groups, but the acetate: propionate ratio tended to decrease in the ensiled cornstalk-fed sheep in comparison to the dry cornstalk-fed sheep, especially significantly different in stage 1 and 3 (P<0.05). The methanogen abundance in the ensiled cornstalk-fed sheep was shown to be significantly lower than the dry cornstalk-fed sheep at 20% concentrate level (P<0.05). During the whole period, the weight gain was not significantly influenced (P>0.05). This result showed that ensiled cornstalk as roughage added to their diet had the effect of reducing the methane emission from sheep when fed 20% concentrate, and the decrease in acetate: propionate ratio might cause the suppression of methanogenesis by depriving of the hydrogen utilized by methanogens to produce methane. (C) 2013 Elsevier B.V. All rights reserved.

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