This study was to investigate the effects of dietary supplementation of daidzein on carcass performance and meat quality of Fattening Xiangzhong Black cattle. Fourteen healthy castrated Hunan black cattle aged about 2 years with similar body weight [(450±20) kg] were randomly divided into two groups (n=7). Control group was fed a basal diet while test group was fed the basal diet added 500 mg/kg daidzein. The experiment lasted for 120 days. The results showed as follows: compared with control group, 1) the supplementation of daidzein had no significant effects on live weight before slaughter, hot carcass weight and dressing percentage, and carcass fat content and backfat thickness tended to decrease with an insignificant difference (P>0.05); 2) daidzein supplementation significantly increased ether extract content and marbling score of longissimus dorsi by 8.34% and 1.93 (P<0.05), respectively, pH after aging for 24 h and moisture content in muscle were significantly reduced (P<0.05), and redness value of muscle was significantly increased (P<0.05); 3) daidzein supplementation significantly reduced serum concentrations of glucose, urea nitrogen, triglyceride, total cholesterol, non-esterified fatty acid, high density lipoprotein cholesterol (HDL-C) and low density lipoprotein cholesterol(LDL-C) (P<0.05); 4) daidzein supplementation significantly increased and reduced the activities of isocitrate dehydrogenase and glucose 6 phosphate dehydrogenase (P<0.05), respectively. The results indicate that dietary supplementation of daidzein can affect fat metabolism, promote intramuscular fat deposition, and improve beef marbling and meat quality of fattening cattle.
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