裹包全混合日粮中添加双乙酸钠对奶牛生产性能及消化特性的影响

Effects of baled total mixed ration supplemented with sodium diacetate on performance and digestive characteristiecs of dairy cows

本试验旨在研究裹包全混合日粮(TMR)中添加双乙酸钠对奶牛生产性能及消化特性的影响。试验选用30头产奶量、胎次、泌乳天数相近的荷斯坦奶牛采用完全随机试验设计,分成3组,每组10头,分别为精粗分开饲喂组(SI)、裹包全混合日粮组(bTMR)和裹包TMR中添加双乙酸钠组(SDA),日粮精粗比均为50∶50。试验期10周。试验结果表明,与SI组相比裹包TMR饲喂奶牛极显著提高奶牛干物质采食量、粗脂肪和粗蛋白质的表观消化率(P<0.01),产奶量、4%标准乳、干物质和有机物的表观消化率也有所提高(P>0.05)。裹包TMR中添加SDA组奶牛乳脂率、乳脂产量显著提高(P<0.05),乳糖含量也较SI组显著提高(P<0.05),粗脂肪、粗蛋白质的表观消化率和4%标准乳也极显著提高(P<0.01)。与精粗分开饲喂方式相比,采用裹包TMR饲喂奶牛可提高奶牛的产奶性能和日粮养分表观消化率,且在裹包TMR中添加双乙酸钠可显著提高乳脂率和乳脂产量(P<0.05)。

This experiment was conducted to study the effect of baled total mixed ration （TMR）supplemented with sodium diacetate on performance and digestive characteristics of dairy cows.Thirty Holstein cows with similar milk yieds, fetal times and day in milk were used in a complete randomized design.All the cows were divided into three groups of 10 cows,which were separate ingredients group （SI）,baled total mixed ration group （bTMR）,and baled total mixed ration supplemented with sodium diacetate group（SDA）.The results showed that group fed baled total mixed ration increased the dry matter intake, apparent digestibility of crude protein and fat （P 〈 0.01 ）significantly, and enhanced the milk production ,4 % FCM yields,the apparent digestibility of dry matter and organic matter （P 〉 0.05）,compared with the SI group. FCM yields,milk fat percentage and yieds in group fed the diet of baled total mixed ration supplemented with sodium diacetate was higher than those in the other two treatments （P 〈 0.01 ） ,and the lactose level was higher than SI group （P 〈 0.05 ）, its apparent digestibility of nutrients of crude fat and crude protein were also increased significantly （P 〈 0.01 ）.It indicated that the baled total mixed ration could increase milk performance and the nutrient apparent digestibility of dairy cows,compared with the control group,and the baled total mixed ration supplemented with sodium diacetate could increase milk fat and yields of dairy cows significantly（P 〈 0.01 ）.