Abstract: In order to discuss the mutton quality of different hybrid progeny under the condition of grazing in the plateau, White Suffolk, Texel, Bond and Australia Merino were used as male parent, and Gansu Alpine Merino were used as female parent to produce mutton through hybridization(set up separately for groupⅠ〖KG-*9〗,Ⅱ,Ⅲ and Ⅳ).Each group has five lambs. Hybrid yearling lambs of four combinations were selected to carry out the experiment of slaughter measurement and mutton analysis. The results showed that introduced varieties can obviously improve the mutton performance of Gansu Alpine Merino.GroupⅠand Ⅳ of four hybrid combinations were the most significant improvement. The muscle level of groupⅠwas evaluated as TM level, which the fat content was a little bit high. The muscle level of group Ⅳ and Ⅱwere evaluated as PME level, and groupⅢ as PL level.

Key words: hybrid model; yearling lamb; mutton performance; carcass quality; internal organs; mutton quality