饲粮中添加后生元对杂交肉羊生长性能、屠宰性能、血清生化指标和肉品质的影响OA

This experiment aimed to investigate the effects of dietary supplementation with postbiotics on the growth performance,slaughter performance,serum biochemical parameters,and meat quality of hybrid mutton sheep.A total of 36 healthy 90-day-old'Dorper×Hu×Suffolk'hybrid mutton sheep with an initial body weight of(33.0±2.68)kg were randomly divided into three groups,with four replicates per group and three sheep per replicate.The control group was fed a basal diet,while the experimental groups were fed the basal diet supplemented with 0.05%(0.05%postbiotics group)and 0.10%postbiotics(0.10%postbiotics group),respectively.The pre-test period was 10 days,and the formal test period was 50 days.The results showed that compared with the control group,the final weight in both the 0.05%and 0.10%postbiotics groups was significantly increased(P<0.05),the average daily gain(ADG)and average daily feed intake(ADFI)were extremely increased(P<0.01),and the feed-to-gain ratio(F/G)was significantly decreased(P<0.05).The carcass weight,dressing percentage,net meat weight,net meat percentage,and meat-to-bone ratio in both the 0.05%and 0.10%postbiotics groups were significantly increased(P<0.05),while the carcass fat content(GR)value was significantly decreased(P<0.05).The concentrations of serum total protein(TP)and globulin(GLB)in both the 0.05%and 0.10%postbiotics groups were significantly increased(P<0.05),while the concentrations of glucose(GLU)and total cholesterol(TC)were significantly decreased(P<0.05).The content of serum albumin(ALB)in the 0.10%postbiotics group was significantly higher than that in the 0.05%postbiotics group and the control group(P<0.05).Muscle water loss rate and shear force in both the 0.05%and 0.10%postbiotics groups were significantly decreased(P<0.05),while cooking rate and unsaturated fatty acid(UFA)content were significantly increased(P<0.05).The concentrations of serum immunoglobulin G(IgG),immunoglobulin A(IgA),and immunoglobulin M(IgM)in the 0.10%postbiotics group were significantly increased(P<0.05),the concentrations of interleukin-6(IL-6)and tumor necrosis factor-α(TNF-α)were significantly decreased(P<0.05).The study shows that dietary supplementation with postbiotics can effectively improve the growth performance,slaughter performance,meat quality,and immune function of hybrid mutton sheep,with the optimal effect observed at a supplementation level of 0.10%.