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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.
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.
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.
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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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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