中文摘要：

试验通过活体外产气量方法，研究了不同饱和度的脂肪酸对β-胡萝卜素瘤胃降解率的影响。结果表明：体外发酵0．5～2h，对照组β-胡萝卜素瘤胃降解率均显著高于处理组（P〈0．05），而处理组间无显著差异（P〉0．05）。体外发酵4h开始，对照组瘤胃内β-胡萝卜素降解率均显著低于处理组（P〈0．01），而处理组间无显著差异（P〉0．05）。油脂的饱和度对β-胡萝卜素瘤胃液内的降解率没有影响，但油脂添加使发酵初期β-胡萝卜素的降解速度变慢，而发酵2h后降解率迅速升高。

英文摘要：

Using an in vitro gas production method, the Expt was designed to determine the effect of different saturated fat on rumen degradability of β-carotene, The result showed that the degradability of β-carotene in control group is significantly higher than treatment groups（P 〈 0.05 ）from 0.5 h to 2 h culture in vitro, and there is no difference between treatment groups（P 〉 0.05）. After fermenting for 4 h, the lower thanthose of treatment groups（P 〈 0.01）, however, th was concluded that the addition of fat itself per se, rather degradability of β-carotene in control group was significantly ere was no difference between treatment groups（P 〉 0.05）. It than its saturation, restarted the rumen degradability of β- carotene in vitro during the first 2 h of fermentation, but increased the degradability after 2 h of incubation.