Studies on microbial and chemical control of methane production from the rumen

瘤胃甲烷通过打嗝释放到环境中。最近，甲烷由于其对全球变暖的贡献而受到关注。本研究旨在研究日粮中添加环糊精包埋的溴氯甲烷（BCM-CD）和二氯甲烷（DCM）对牛甲烷和氢气产生、瘤胃发酵和纤维消化的影响。另一方面，添加BCM-CD显著增加了氢的释放。瘤胃乙酸摩尔比例降低，丙酸摩尔比例升高。日粮中添加1g/100 kgBW/day的DCM-CD对瘤胃发酵和甲烷产量无影响，添加1g/100 kgBW/day的DCM-CD对瘤胃发酵和甲烷产量无影响。通过开路呼吸系统测量CD对甲烷产生的影响。添加BCM-CD使甲烷产量降低了95%。采食量、日粮纤维表观消化率、瘤胃纤毛虫浓度、挥发性脂肪酸和氨浓度均无变化。结果表明，添加BCM-CD后，瘤胃内乙酸的摩尔比例降低，丙酸的摩尔比例升高，表明BCM-CD对瘤胃内甲烷的产生有较强的抑制作用，但不影响瘤胃内纤维的消化。

Ruminal methane is released into the environment info by eructation. Recently, methane has received attention due to its contribution to global warming. The aims of this study were to determine the effect of dietary addition of bromochioromethane (BCM) and dichloromethane (DCM) encapsulated in a cyclodextrin (CD) matrix on methane and hydrogen production, rumen fermentation and fiber digestion in cattle.The addition of 1g/lOOkgBW/day BCM-CD decreased methane emission greatly from i day after the start of addition. On the other hand, addition of BCM-CD increased hydrogen emission markedly. Molar proportion of ruminal acetic acid decreased and that of propionic acid increased. Ruminal concentration of total VFA and pH value were unchanged.The addition of 1g/lOOkgBW/day DCM-CD had no effects on methane production and rumen fermentation.Effect of the addition of BCM.-CD on methane production was measured by an open-circuit respiratory system. The addition of BCM-CD decreased methane production by 95%. Feed intake, apparent digestibility of dietary fibre, ruminal concentration of ciliate protozoa, VFA and ammonia were unchanged. Molar proportion of ruminal acetic acid decreased and that of propionic acid increased by the addition of BCM-CD.These results suggest that BCM-CD enable the potent inhibiting effect on methane production without affecting the fiber digestion in the rumen.