[目的]通过相关性分析,揭示甘肃省甘南藏族自治州（简称“甘南州”）牦牛乳中蛋白质、非脂乳固体、IgA、IgM、共轭亚油酸与产地海拔、气温、降水量的关联。[方法]测定2023年甘南州合作市、玛曲县、碌曲县、夏河县、卓尼县5 个地区牦牛乳中蛋白质、非脂乳固体、IgA、IgM、共轭亚油酸的含量。[结果]甘南州5 个地区牦牛乳中蛋白质的平均含量为4.45%,非脂乳固体的平均含量为10.49%,IgA的平均含量为2.044 μg/mL,IgM的平均含量为17.129 μg/ml,共轭亚油酸的平均含量为1.326 mg/g。[结论]甘南州牦牛乳中蛋白质、非脂乳固体含量与8月平均最高气温、年均低温呈显著负相关;IgA含量与年均低温显著正相关;IgM、共轭亚油酸含量分别与8月总降水量、年均总降水量显著负相关,上述研究结果可为今后研究环境因子与牦牛乳品质之间的关系提供参考。
[Objective] Through correlation analysis,to reveal the correlations between proteins,non-fat milk solids,IgA,IgM,conjugated linoleic acid in yak milk from Tibetan Autonomous Prefecture of Gannan,Gansu Province（referred to as "Gan Nan Prefecture"）and the altitude,temperature,and precipitation of the region. [Method] The contents of protein,non-fat milk solids,IgA,IgM,and conjugated linoleic acid in yak milk in regions of Gonghe City in 2023,Maqu County,Luqu County,Xiahe County and Zhuoni County in Gan Nan Prefecture were determined. [Result] The average protein content in yak milk in 5 regions of Gannan Prefecture was 4.45%,the average non-fat milk solids was 10.49%,the average content of IgA was 2.044 μg/ml,the average content of IgM was 17.129 μg/ml,and the average content of conjugated linoleic acid was 1.326 mg/g. [Conclusion] The protein and non-fat milk solids content in the yak milk from Gannan Prefecture were significantly negatively correlated with the average maximum temperature in August and the annual average low temperature;the IgA content was significantly positively correlated with the annual average low temperature;the IgM and conjugated linoleic acid contents were significantly negatively correlated with the total precipitation in August and the annual total precipitation respectively. The results of this study can provide a reference for future research on the relationship between environmental factors and yak milk quality.
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