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Fatty acid profile of yak milk from the Qinghai-Tibetan Plateau in different seasons and for different parities |
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| Authors: | Liu H N Ren F Z Jiang L Ma Z L Qiao H J Zeng S S Gan B Z Guo H Y |
| Affiliation: | * College of Food Science and Technology Engineering, Gansu Agricultural University, Lanzhou 730070, China † Key Laboratory of Functional Dairy, Beijing Higher Institution Engineering Research Center of Animal Product, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China ‡ E (Kika) de la Garza American Institute for Goat Research, Langston University, Langston, OK 73050 |
| Abstract: | Yaks are the most important grazing livestock for milk production on the Qinghai-Tibetan plateau because these animals are adapted to the high elevations and extremes of cold and can graze throughout the year. In the present study, 30 yaks were selected and the fatty acid (FA) profile of yak milk at different seasons and parities was investigated using gas chromatography. The concentrations of cis-9 C18:1, cis-11 C18:1, cis-9,trans-11 C18:2, and C18:3 n-3 in yak milk were higher in summer (25.26, 1.50, 1.46, and 0.33 g/100 g of total FA, respectively) than in winter (22.17, 0.77, 1.27, and 0.28 g/100 g of total FA, respectively). The contents of monounsaturated and polyunsaturated FA in milk fat of multiparous (parities 2 to 5) yaks (31.61 and 4.20 g/100 g of total FA, respectively) were higher than those in primiparous yaks (29.61 and 3.80 g/100 g of total FA, respectively). These results suggest (1) that the potential exists to improve the FA composition of yak milk by developing local supplement resources during the winter and (2) that multiparous yaks have a more favorable FA profile than primiparous yaks. |
| Keywords: | yak milk fatty acid season parity |
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