The objective of present study was to reveal the biochemical characteristics of milk from Tibetan Yellow cattle at highlant,milk protein composition and casein polymorphisms. Tibetan Yellow cattle contains low protein content in minds. A total of 43 Tibetan Yellow cattle at Jiulong county of Sichuan province were used to assay milk protein contelk (only about 29g/L) ;skim milk protein composition was similar to that of cow as revealed by electrophoresis. Main milk protein components include casein,α-lactalbumin,and β-lactoglobulin. The ratio of milk β-Lg to α-La content was lower that that of yak. The relative percentage of casein was approximately 70％ ,including αs-casein and β-casein. Three and two genotypes of αs-casein and β-casein were detected,respectively. Our results indicated that there was difference in milk composition between Jiulong Titetan Yellow cattle and Jiulong yaks that live in similar ecological environment.%本研究旨在了解生活在高海拔地区的藏黄牛乳的生化组成特点.试验测定了43头九龙藏黄牛乳蛋白含量、乳蛋白组成和酪蛋白多态性.藏黄牛乳蛋白含量低,仅约为29 g/L;电泳分析结果显示,脱脂乳蛋白组成与普通牛乳接近,主要包括酪蛋白、α-乳清蛋白和β-乳球蛋白等组分,β-Lg与α-La含量的比值低于牦牛;酪蛋白的相对含量约为70%,主要包含α5-CN和β-CN,二者分别检测到3和2种基因型.研究结果表明,九龙藏黄牛乳的组成与生活在类似生态环境中的九龙牦牛存在差异.
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