家畜生态学报2017，Vol.38Issue(6)：13-17,5.
饲用甜高粱青贮替代玉米青贮对泌乳中后期奶牛产奶性能的影响
Effects of Substitution of Forage Sorghum Silage for Corn Silage onMilk Performance of Dairy Cows in Middle and Late Lactation
摘要
Abstract
The experiment was conducted to study the effects of substituting forage sorghum silage for corn silage on milk performance of dairy cows in middle and late lactation.Forty healthy Holstein cows in middle and late lactation with same weight, age and milk yield were randomly divided into 2 groups (control group and experimental group) and 20 cows in each group, feeding separately.Cows in control group were fed with the mixed feed containing corn silage, those in the experimental group were fed with the mixed feed containing forage sorghum silage.The experiment lasted for 70 days comprised a 10 d adaptation and 60 d trial period.The results showed that the average daily milk yield of both groups were decreased gradually, the average daily milk yield of the experimental group and the control group were 16.48±3.92, 16.37±4.66 kg/day, respectively, which was higher in the experimental group than the control group, but with no significant difference(P>0.05).As the experiment went on, the milk fat percentage, milk protein percentage, lactose, total solids, and non-fat solids were increased, while the freezing point and urea nitrogen of milk in the experimental group were decreased compared with the control group.There was no significant difference in milk composition between the experimental group and the control group(P>0.05).The milk protein content and milk urea nitrogen content in the 0~60 d experimental group had a tendency to be higher than those in the control group.The milk protein rate and urea nitrogen content of the experimental group were 3.60% and 16.88 mg/100 ml, respectively.The milk yield and milk composition of cows in middle and late lactation that were fed with forage sorghum silage instead of corn silage were close.Therefore, it is feasible to substitute forage sorghum silage for corn silage in the diet of dairy cows.关键词
饲用甜高粱青贮/玉米青贮/奶牛/产奶性能Key words
forage sorghum silage/corn silage/dairy cow/milk performance分类
农业科技引用本文复制引用
何周瑞,刘亚伟,谭世新,赵健康..饲用甜高粱青贮替代玉米青贮对泌乳中后期奶牛产奶性能的影响[J].家畜生态学报,2017,38(6):13-17,5.基金项目
新疆维吾尔自治区农业科技推广与服务项目 （）
