微生态制剂对奶牛增奶的实验研究

为了研究微生态制剂对奶牛的增奶效果。选择胎次、泌乳量相似的黑白花奶牛，在饲料配方、饲养管理、坏境条件相同的情况下，试验组添加50g微生态制剂，对照组不添加，统计各自产奶量和比重。结果试验组试验后比本组预试期产奶量增加10．31％，奶比重增加0.029％；试验后试验组比同期对照组产奶量增加7.26％，奶比重增加0．048％。说明微生态制剂能提高奶牛)的产奶量和比重。

A Study of Micro-Ecological Agent on Milk Production of Dairy Cows

The objective of this study was to evaluate the effects of direet-fed microbial (DFM) on milk production,milk speefie gravity of dairy cows.Eighty delivered black-and-white dairv cows with similar fetuses and milk yielding were randomly divided into two equal groups under same feed formula,management and environmental conditionswith DFM(50g/d per cow,as treatment)or without DFM (as CK).Milk production and milk specific gravity were de.termined each day during experimental period.The average milk production and the average milk specific gravity were inereased by 10.31% and 0.029% ,respectively,in experiment stage than in pre-experiment stage within the same group (DFM-adding group).The average milk production and average milk specific gravitv were increased hy 7.26% and 0.048%,respectively,in DFM-adding group than in CKduring the same period.Thc resulls in-dicated that feeding dairv cows with micro-ecological agent increased milk production and specific gravity.