Abstract: In order to investigate the effect of house-feeding on carcass traits and quality and nutrients of muscle, six male Jinchuan male yak and three male cattle-yak with similar medium body condition were selected randomly, and divided into two groups with or without the house-feeding, while the performance of slaughter, the quality and nutrient composition of the muscle among three groups （the yak, the cattle-yak, and grazing yak groups） were observed. The results showed that the live body weight, carcass weight, net meat weight and meat-bone ratio of the yak with house-feeding were higher than those of the grazing yak significantly （P<0.05）, on the contrary, there was no significant difference between the yak and cattle-yak in the carcass weight, bone-to-bone ratio and the gain of body weight. The hydraulic performance of the yak muscle wasn’t affected by the house-feeding, which improving the tenderness of raw meat and the ratio of cooked meat and those are beneficial to the production of downstream process products. What’s more, the test results showed that the content of various nutrients and amino acids in the yak meat among the three groups were not different significantly, that is to say, the pattern of house-feeding have no significant influence on the nutrient of the yak meat.

Key words: yak（Bos mutus）, house-feeding, carcass traits, the quality of muscle