【Objective】In order to make the full use of high-quality alfalfa resources in Hexi Corridor, and improve the production level and economic benefits of dairy cows. 【Method】This text selected the 40 Holstein cows that had the same age, parity, milk production, and physiological status basically, and randomly divided them into control group, test groups Ⅰ, II and III . We added 0kg, 10kg, 15kg, 20kg alfalfa hay to the diet of each group respectively , and the amount of concentrate feeding is reduced by 0%, 10%, 15%, 20%, studied the effects of the milk yield, milk composition and economic benefits of the early lactation cows with the different feeding rates of alfalfa hay. 【Result】The results showed that there was a significant difference in milk production in test group I, and there was a very significant difference in milk production in test groups II and III. There is no significant difference in milk composition in each test group. Milk somatic cells are 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, significantly improve the milk composition, in particular, adding 15kg alfalfa hay daily instead of concentrate had the best benefit. |