瘤胃稳定性脂肪对产后奶牛奶产量、牛奶成份和外周血白细胞数量的影响

Effect of Rumen-undegraded Fat on Milk Yield, Milk Composition and Peripheral Leukocyte Number in Post-parturition Dairy Cows

选择经产、胎次相同和产奶量相近的荷斯坦奶牛40头,配对分组设计分为对照组和试验组,每组20头。对照组全程饲喂基础日粮,试验组饲喂基础日粮+瘤胃稳定性脂肪。结果:瘤胃稳定性脂肪对奶牛采食量无显著影响(P>0.05);试验组牛产奶量显著升高(P<0.05),乳脂率呈上升趋势(P>0.05),但乳蛋白率未见显著变化(P>0.05);试验组奶牛外周血白细胞总数和淋巴细胞数轻度上升(P>0.05),牛奶SCC呈下降趋势(P>0.05)。结果表明,补充瘤胃稳定性脂肪可提高产奶量,对于改善机体免疫机能有一定的作用。

Forty multiparous Holstein dairy cows with similat pality and milk yielding of the last year were allocated equally into a control and an experimental group according to matched-pair grouping design. Beginning at the day of parturition until 90 days after parturition, cows in the experimental group were fed basic diet supplemented with 400 g tureen-passed fat. It was found that rumen-passed fat did not alter dry matter intake （DIM）（P〉0.05）. However, it increased milk yielding（P〈0.05）. Milk fat percentage tended to be increased by supplemental fat, although the differences between the two groups were not pronounced（P〉0.05）. There were no differences in milk protein percentage between the two groups（P〉0.05）. Supplemental fat had minor effect on total number of peripheral leukoeytes and the number of lymphocyte（P〉0.05）; however, it tended to reduce somatic cell counts （SCC） in milk （P〉 0.05）. It was concluded that supplemental fat increased milk yielding, and improved immune function to a certain extent.