| The fatty acid compositions and contents of yak milk, pien niu milk and yak meat from different sources were detected by GC-MS,and the content of functional fatty acids was mainly used to evaluate the quality of yak milk and yak meat. The results showed that 47,46 and 37 fatty acids were identified from yak milk,pien niu milk and yak meat, respectively. The content of branched chain fatty acids (BCFA) and n-6/n-3 ratio in yak milk of different months and altitudes were very significant (P <0001). By comparison, it was found that the quality of yak milk collected from 3 500 m summer pasture in August was the best.Pien niu milk was rich in functional fatty acids, which was close to the fatty acid composition of yak milk.The difference in the content of functional fatty acids and n-6/n-3 ratio in yak meat by different feeding methods was significant.The contents of DHA, DPA, EPA, BCFA and other functional fatty acids in grazing yak meat was significantly higher than feeding fattening yak meat, so the quality of grazing yak meat was better. |
