不同方式处理的全株玉米青贮对奶牛生产性能和经济效益的影响

目的]探究不同方式制备的全株玉米青贮饲喂奶牛后，对其生产性能和经济效益的影响。方法]选定中国荷斯坦牛开展全株玉米青贮饲喂试验。将28头奶牛随机分为对照组和试验组，每组14头。前者饲喂不添加菌剂制备的全株玉米青贮，后者饲喂添加青贮菌剂制备的全株玉米青贮。统计各组奶牛日均干物质采食量、日均产奶量、料重比、乳脂率和乳蛋白率，计算各组奶牛日均经济效益和试验期总经济效益。结果]采用添加青贮菌剂制备的全株玉米青贮饲喂奶牛后，奶牛日均干物质采食量和料奶比与对照组差异不显著，但日均产奶量、平均乳脂率和乳蛋白率显著提高（P<0.05）。每头牛日均产奶量增加1.91 kg，乳脂率增加0.22个百分点，乳蛋白率增加0.06个百分点。试验组经济效益明显提高，每头牛日均经济效益增加4.73元，正试期内总经济效益增加1 986.60元。结论]采用添加青贮菌剂的全株玉米青贮饲喂奶牛，能有效提高奶牛的生产性能和经济效益。

Effects of Whole-plant Corn Silage Treated by Different Methods on Production Performance and Economic Benefits of Dairy Cows

Objective]The purpose of this study was to explore the effects of whole-plant corn silage treated by different methods on the production performance and economic benefits of dairy cows.Method]In this experiment,Chinese Holstein cows were selected to carry out whole-plant corn silage feeding test.28 cows were randomly divided into control group and experimental group,with 14 cows in each group.The former was fed with whole-plant corn silage prepared without adding microbial agent and the latter was fed with whole-plant corn silage prepared with microbial agent.The average daily dry matter intake,average daily milk yield,feed/milk ratio,milk fat rate and milk protein rate of each group were calculated,the average daily economic benefits and total economic benefits of each group were calculated.Result]The average daily dry matter intake and feed/milk ratio of dairy cows were not significantly different from the control group,but the average daily milk yield,average milk fat rate and milk protein rate were significantly increased （P<0.05）.The average daily milk yield per cow increased by 1.91 kg,the milk fat rate increased by 0.22%,and the milk protein rate increased by 0.06%.The economic benefit of the experimental group was significantly improved,the average daily economic benefit of each cow increased by 4.73 yuan,and the total economic benefit of trial period increased by 1 986.60 yuan.Conclusion]The whole-plant corn silage added with microbial agent was used to feed dairy cows,which could effectively improve the production performance and economic benefits of dairy cows．