河西走廊紫花苜蓿干草不同喂量对泌乳前期奶牛生产性能的效应研究

Effects of Different Feeding Amount of Alfalfa Hay in Hexi Corridor on Production Performance of Dairy Cows in Early Lactation

[目的]为了充分利用河西走廊优质紫花苜蓿资源,提高奶牛生产水平和经济效益。[方法]试验选取年龄、胎次、产奶量、生理状况等基本相同的荷斯坦奶牛40头,随机分为对照组、试验Ⅰ、Ⅱ、Ⅲ组,分别在日粮中添加0 kg、10 kg、15 kg、20 kg紫花苜蓿干草,精料喂量相应减少0、10%、15%、20%,进行紫花苜蓿干草不同喂量对泌乳前期奶牛产奶量、乳成分和经济效益的的试验研究。[结果]结果显示,试验Ⅰ组产奶量差异显著,试验Ⅱ、Ⅲ组产奶量差异极显著;各试验组乳成分差异不显著;牛奶体细胞与奶牛产量呈负相关。[结论]结果表明,河西走廊泌乳前期奶牛日粮中添加紫花苜蓿干草,可显著提高泌乳量,明显改善乳成分,尤其以每日添加15 kg紫花苜蓿干草代替精料的效益最优。

[Objective]Make full use of high-quality alfalfa resources in Hexi Corridor,and improve the production level and economic benefits of dairy cows.[Method]This test selected 40 Holstein cows that were at the same age,and had the same parity,milk production,and physiological status basically,and randomly divided them into control group,test groupsⅠ,II,and III.To study the effects of the milk yield,milk composition,and economic benefits of the early lactation cows with the different feeding rates of alfalfa hay,0kg,10kg,15kg,20kg alfalfa hay was added to the diet of each group respectively,and the amount of concentrate feeding is reduced by 0%,10%,15%,20%.[Result]The results showed that there was a significant difference in milk production in test group I,and a very significant difference in milk production in test groups II and III.There was no significant difference in milk composition in each test group.Milk somatic cells were negatively correlated with cow yield.[Conclusion]The results showed that the addition of alfalfa hay to the diets of the early lactation cows in the Hexi Corridor can significantly increase the milk yield,and significantly improve the milk composition.Especially adding 15kg alfalfa hay daily instead of concentrate had the best benefit.