Effects of dietary α-lipoic acid supplementation on growth performance,meat quality and muscle antioxidant performance of beef cattle
To investigate the effects of dietary α-lipoic acid supplementation on growth performance,meat quality and muscle antioxidant performance of beef cattle.(Experimental design)A total of 80 healthy western beef cattle with body weight of(390.47±28.31)kg were divided into 4 groups with 20 cows per group and 1 replicate per cow.The experimental diets were supplemented with 0,150,300 and 600 mg/kg α-LA in the basal diet,respectively.The test was measured for 100 days,including a one-week adaptation cycle.The results showed that,compared with the control group,FBW in 300 and 600 mg/kg α-LA groups was significantly increased by 2.59% and 1.80%,respectively(P＜0.05).ADG of beef cattle in 150-600 mg/kg α-LA group was significantly increased by 7.79%,9.37% and 7.22%,respectively(P＞0.05);F/G of beef cattle in the 150～600 mg/kg α-LA group was significantly decreased by 5.94%,7.57% and 6.18%,respectively(P＞0.05).In addition,α-LA had no significant effect on beef cattle ADFI(P＞0.05).Compared with control group,beef pH and redness of beef in 150-600 mg/kg α-LA group were significantly increased(P＜0.05);Beef yellowness in 150-600 mg/kg α-LA group was significantly decreased(P＜0.05);Beef shear strength of beef cattle in 150-600 mg/kg α-LA group was significantly decreased(P＜0.05);In addition,α-LA had no significant effects on the brightness,drip loss and cooking loss of beef(P＞0.05).Keap1 gene expression in longissimus dorsi muscle of beef cattle in 300 and 600 mg/kg α-LA groups was significantly decreased(P＜0.05);SOD gene expression in longissimus dorsi muscle of beef cattle in 150-600 mg/kg α-LA group was significantly increased(P＜0.05);Keap1 gene expression in hind leg muscle of beef cattle in 150-600 mg/kg α-LA group was significantly decreased(P＜0.05);The expression of Nrf-2 gene in hind leg muscle of beef cattle in 300 and 600 mg/kg α-LA groups was significantly increased(P＜0.05);SOD gene expression in hind leg muscle of beef cattle in 600 mg/kg α-LA group was significantly increased(P＜0.05).Conclusion:α-LA supplementation can promote the growth of beef cattle.In addition,α-LA can improve meat quality by regulating the expression of antioxidant genes in beef.
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