Ruminal fermentation, nutrient metabolism, and methane emissions of sheep in response to dietary supplementation with Bacillus licheniformis
文献类型： 外文期刊
第一作者： Deng, K. D.
作者： Deng, K. D.;Chen, Y. H.;Jiang, J. J.;Xiao, Y.;Ma, T.;Tu, Y.;Diao, Q. Y.
作者机构： Jinling Inst Technol, Coll Anim Sci, Nanjing 210038, Jiangsu, Peoples R China;Chinese Acad Agr Sci, Feed Res Inst, Key Lab Feed Biotechnol, Minist Agr, Beijing 100081, Peoples R China
关键词： Bacillus licheniformis; Digestibility; Efficiency; Methane; Rumen fermentation; Sheep
期刊名称：ANIMAL FEED SCIENCE AND TECHNOLOGY （ 2020影响因子：3.247； 五年影响因子：3.806 ）
ISSN： 0377-8401
年卷期： 2018 年 241 卷
收录情况： SCI
摘要： Some bacterial preparations have been used as rumen methane (CH4) mitigants, but the effect of the spore-forming bacterium Bacillus licheniformis on ruminal methanogenesis is unknown. In this study, twenty-four Dorper crossbred wethers (45.0 +/- L96 kg of body weight) were randomly assigned to 4 dietary treatments (6 animals/treatment): a basal diet (control), or the basal diet supplemented with 2.5 x 10(8) (low; L), 2.5 x 10(9) (medium; M), or 2.5 x 10(10) (high; H) colony forming units of B. licheniformis per animal per day. Ruminal fermentation characteristics, apparent digestibility and metabolism of nutrients and gross energy, and in vivo methane emissions were measured. The L group had lower ruminal ammonia nitrogen concentrations than the control (78.5 vs. 100.8 mg/L; P = 0.001). Dietary B. licheniformis supplementation enhanced the apparent digestibility of dry matter, organic matter, N, and neutral detergent fiber (P < 0.001), improved the N retention and utilization efficiency (P = 0.005), and energy metabolizability (P < 0.001). Daily CH4 production in the L and M groups was lower than that in the control (39.9 and 39.8 vs. 42.5 L/d; P = 0.017 and 0.011, respectively), and these effects were also mirrored by relative CH4 production to dry matter (DM) intake (31.7 and 31.6 vs. 33.8 L/kg DM intake; P = 0.017 and 0.012, respectively). Relative CH4 production to digestible DM intake in the L, M, and H groups was lower than that in the control (P < 0.001). Dietary B. licheniformis supplementation effectively reduced in vivo methane emissions from sheep with concomitant improvement of their energy and protein utilization.
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