为探究不同饲养方式对西门塔尔牛的产奶量、乳品质和血液生化指标的影响。选取16 头泌乳后期产奶量、日采食量、体重接近,胎次相同、精神良好、体质健康的西门塔尔牛,随机分成2 组,分别为舍饲组和放牧+补饲组,每组8 头。舍饲组每天饲喂2 次,放牧+补饲组每天放牧8 h后补充1.0 kg/天·头混合精饲料,试验30 天。结果显示,放牧+补饲组在试验第15天和第30天时比舍饲组产奶量分别提高了10.09%和11.62%（P<0.05）,且放牧+补饲组有利于减缓泌乳后期奶牛产奶量下降趋势。放牧+补饲组牛乳中的乳脂率和乳糖含量比舍饲组分别提高了6.35%和10.65%,差异显著（P<0.05）,乳蛋白率、总固形物、非脂乳固体差异不显著（P>0.05）。放牧+补饲组血清总蛋白、白蛋白和血糖含量比舍饲组分别提高了11.69%、14.21%、20.49%,差异显著（P<0.05）,而尿素氮和碱性磷酸酶差异不显著（P>0.05）。结果表明,牧草丰盛时,采用放牧+补饲的饲养方式有利于改善西门塔尔牛的泌乳性能,改善乳品质,促进西门塔尔牛体内蛋白质和糖物质代谢水平。

To explore the effects of different feeding methods on milk yield,milk quality and blood biochemical indexes of simmental cattle. In this experiment,16 simmental cattle with the same parity,good spirit and healthy physique were selected. They were randomly divided into two groups: house feeding group and grazing + supplementary feeding group,with 8 heads in each group. The house feeding group was fed twice a day,and the grazing + supplementary feeding group was supplemented with 1.0 kg / day·head mixed concentrate after grazing for 8 hours a day for 30 days. The results showed that the milk yield of grazing + supplementary feeding group increased by 10.09% and 11.62% respectively on the 15th and 30th day of the experiment（P < 0.05）.The grazing + supplementary feeding group was beneficial to slow down the downward trend of milk yield in the late lactation stage. The milk fat rate and lactose content in grazing + supplementary feeding group were 6.35% and 10.65% higher than those in house feeding group,respectively （P < 0.05）. There was no significant difference in milk protein rate,total solids and non fat milk solids（P > 0.05）. The contents of serum total protein,albumin and blood glucose in grazing + supplementary feeding group were 11.69%,14.21% and 20.49% higher than those in house feeding group, respectively （P < 0.05）,but there was no significant difference in urea nitrogen and alkaline phosphatase （P > 0.05）. The results showed that the feeding mode of grazing + supplementary feeding was beneficial to improve the lactation performance,milk quality and protein and sugar metabolism of simmental cattle.