β-胡萝卜素对绵羊瘤胃微生物发酵参数的影响

试验采用自身对照法试验设计,选用6只安装有永久性瘤胃瘘管的去势蒙古公羊,分3组,即0.000%β-胡萝卜素(对照组)、0.005%β-胡萝卜素和0.008%β-胡萝卜素组,研究在日粮中添加β-胡萝卜素对绵羊瘤胃内环境及微生物发酵参数的影响。结果表明:日粮中添加β-胡萝卜素对绵羊瘤胃中pH值没有影响;日粮中添加β-胡萝卜素有降低绵羊瘤胃中氨态氮含量的趋势;日粮中添加β-胡萝卜素使绵羊瘤胃中菌体蛋白含量降低,且存在随β-胡萝卜素添加比例的增加菌体蛋白含量有降低的趋势;日粮中添加β-胡萝卜素有促进瘤胃中TVFA含量升高和降低乙丙比的趋势。

Effects of β-carotene on the parameters of rumen microbial fermentation in sheep

In this experiment,six castrated Mongolian sheep with permanent rumen fistula were selected,including the 0.000%(the control)、0.005% and 0.008% β-carotene groups,to determine effects of β-carotene on the parameters of rumen environment and microbial fermentation.The results showed that:Impacts of β-carotene on the rumen pH value was not significant difference;There are a tendency that the concentration of NH3-N reduced in rumen liquid by supplements of β-carotene,but it was not significant comparing the control group.The concentration of bacterial protein in rumen liquid reduced by supplements of β-carotene,and the average of bacterial protein in the control group was significantly higher than the 0.008% β-carotene group(P <0.05),and was higher than the 0.005% β-carotene group,but the difference was not significant.The concentration of TVFA in rumen liquid increased with addition proportion of β-carotene.At the same time the ratio of acetic acid/propionic acid reduced with addition proportion of β-carotene.