| This research was divided into two stages, in the first stage 100 healthy lambs in 2-3 months were chosen, which were divided into five groups by completely random. In each group, the average weight was about 18kg.The experiment was designed by two factors(energy and protein) and five levels. Five groups were feed different nutrition level of diets respectively for 40 days, and the effects of nutrition level on growth performance of lamb were observed.The first stage of this experiment measured the physical indexes of lamb after fattening, four lambs with medium condition from each group were chosen for slaughter trial, and analyzed slaughter index, histological property of meat, content of amino acid. The experiment mainly discuss the effects of nutrition level on the slaughter index and meat quality of lamb. The experiment results were following:Positive correlation existed between the growth performance and nutrition level of diet (P<0.05) . The proper increase of protein level improved the growth rate remarkably under middle energy level, and the difference was significant (P<0.05). but increasing protein level under high energy level was not significant (P>0.05).Under the same protein level, the increase of energy level improved the growth performance of lamb significantly, the analysis of economic benefits demonstrated that the lamb with high nutrition level had high economic benefits.The proper increase of protein level improved the growth performance remarkably, and the difference of ante-mortem live weight before slaughter was significant (P<0.05). But increasing protein level under high energy level was not significant (P>0.05). the change tendencies of carcass weight and dressing percent were similar to ante-mortem live weight.Increasing the fattening intensity improved meat color, cooked-meat percent and ribeye area remarkably, but the variety of PH value, shear force, muscle fiber diameter were...
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