日粮中淀粉及蛋白质水平对青年母牛产后产奶量的影响

Effects of Starch and Protein Levels in Young Cows’Diets on Postpartum Milk Yield

本试验研究了日粮不同淀粉、蛋白质水平对青年牛产后35d、70d单产的影响。结果显示,日粮淀粉水平对青年牛产后35d、70d单产影响显著,淀粉水平14%~15%组和15%~16%组两组间单产差异不显著,但均显著高于13%~14%组和16%~17%组。通过对比不同蛋白水平下青年牛产后35d、70d单产变化,发现日粮蛋白水平13%~14%组在产后35d时单产显著高于其他组别;13%~14%与14%~15%组在产后70d单产无显著差异,达36.1kg,两组显著高于其他组别,但14%~15%组高峰奶量最高且高峰日也较其他组延迟。

This paper mainly studied the effects of different dietary starch levels on the unit yield of head fetus at 35d and 70d,and the effects of different dietary protein levels on the unit yield of head fetus at 35d and 70d.The results showed that the dietary starch level had a significant effect on the unit yield 35 and 70 days after the first birth.There was no significant difference between the starch level 14%~15%group and 15%~16%group,but they were significantly higher than the starch level 13%~14%group and 16%~17%group.When the dietary protein level was 13%~16%,the postpartum unit yield was significantly higher than that in the dietary protein level 10%~13%group at 35 and 70 days.The results showed that the unit yield of 13%~14%group was significantly higher than that of other groups at 35 days postpartum.However,there was no difference in unit yield between 13%~14%and 14%~15%groups at 70 days postpartum,up to 36.1kg,but the two groups were significantly higher than other groups.