Effects of a partial substitution of corn with wheat on the distribution of muscle fiber types and meat quality traits in plateau-type Tibetan sheep
In this study,we sought to determine the effects of substituting 10％of dietary maize with wheat flour on muscle fiber types,fatty acid contents,and antioxidant properties in plateau-type Tibetan sheep(Ovis aries).Sixty 2～3th-old plateau Tibetan lambs with similar initial body weight[(19.35±2.18)kg]and good development were randomly divided into one of two groups(with 5 repetitions per group),namely,a corn group(CG:fed pure corn as a concentrate)and a wheat group(WG:10％of the corn concentrate substituted with wheat).The results revealed that compared with the CG group lambs,there were significantly fewer type Ⅰ muscle fibers in the WG group lambs(P＜0.01),whereas the number of type Ⅱmuscle fibers showed the opposite trend(P＜0.01).In addition,the relative mRNA expression of the MyHCI gene in WG group lambs was significantly higher than that in the CG group lambs(P＜0.01),whereas the relative expression of the MyHC Ⅱb gene.The relative expression of docosanoic acid(C22:0)in CG group lambs was significantly higher than that in the WG group lambs(P＜0.05),whereas the relative expression of docosatrienoic acid(C22:3)in the CG group was significantly lower than that in the WG group(P＜0.05).Moreover,the two groups were found to show opposite trends with respect to total antioxidant capacity,malondialdehyde content,and glutathione peroxidase activity(P＜0.01).However,we detected no significant difference between the two groups with respect to the activities of the enzymes catalase and superoxide dismutase(P＞0.05).The findings of this study indicate that replacing 10％of dietary corn with wheat contributes to a certain improvement in the quality of plateau Tibetan sheep meat.
sheephistomorphologyfatty acidsantioxidant indexgene expressionconcentrate to roughage ratioATPase
万方数据
维普
