复合有机微量元素对肉鸡生长性能、肉品质、器官发育及血清生化指标的影响OA

The experiment aimed to investigate the effects of compound organic trace minerals(OTM)on the growth performance,meat quality,organ development,and serum biochemical indices of broilers.A total of 340 healthy Ross 308 broilers at one day of age with similar body weight were randomly divided into two groups,namely group NY/T-ITM and group NRC-OTM,with five replicates per group and 34 broilers per replicate.The dietary compositions of the two groups were identical except for manganese(Mn),zinc(Zn),and selenium(Se).In group NY/T-ITM,Mn,Zn,and Se were supplemented in the forms of manganese sulfate monohydrate(MnSO4·H2O),zinc sulfate monohydrate(ZnSO4·H2O),and sodium selenite(Na2SeO3),respectively,with supplementation levels referring to the Chinese Feeding Standard of Chicken(NY/T 33-2004).In group NRC-OTM,there were supplemented in the forms of manganese methionine(Mn-Met),zinc methionine(Zn-Met),and selenium yeast(Se-Y),respectively,with supplementation levels referring to the NRC(1994)nutrient requirements of broilers.The trial period lasted for 42 days.The results showed that compared with group NY/T-ITM,group NRC-OTM had no significant differences in body weight at 21 and 42 days of age(P>0.05).There were no significant differences in average daily feed intake(ADFI),average daily gain(ADG),feed-to-gain ratio(F/G)at different growth stages,and the European Production Index(EPI)from 1 to 42 days of age(P>0.05).The cooked meat rate,and the concentrations of crude protein(CP)and crude fat(EE)in breast muscle at 42 days of age of group NRC-OTM were significantly increased(P<0.05),and the shear force significantly decreased(P<0.05),while no significant differences were observed in the concentrations of dry matter(DM)and crude ash(Ash),cooking loss,and gross energy(GE)(P>0.05).The group NRC-OTM had a significantly increased thymus index at 42 days of age(P<0.05),but no significant differences were found in bursa of Fabricius index,spleen index,and the relative length,relative weight,and weight/length ratio of small intestinal segments(P>0.05).The serum glucose(GLU)content at 42 days of age in group NRC-OTM was significantly decreased(P<0.05),while there were no significant differences in other serum biochemical and antioxidant indices(P>0.05).The study shows that replacing the inorganic Mn,Zn,and Se with organic Mn,Zn,and Se at reduced dosages can improve breast meat quality and reduce the serum GLU content in 42 days of age broilers without negatively affecting growth performance or antioxidant capacity.