To investigate the effects of compound probiotics(CPP)on the growth performance,meat quality,and serum immune indicators of Sunzhi chicken.Select 600 healthy,immunized 1-day-old Sunzhi chickens(34.15±1.47 g)and randomly divide them into 4 groups,with 10 replicates in each group and 15 chickens per replicate.Each group was fed with experimental feed containing basic feed+0,120,240,and 480 mg/kg CPP for a total of 120 days.On the basis of consistent initial weight among all groups of Sunzhi chickens(P＞0.05),compared with the control group,the final weight of Sunzhi chickens in the 480 mg/kg CPP group increased by 7.95%(P＜0.05),and the feed to meat ratio decreased by 3.73%(P＜0.05).The daily weight gain of Sunzhi chickens in the 240 and 480 mg/kg CPP groups significantly increased by 4.05%and 8.11%(P＜0.05),respectively,and the feed intake significantly increased by 3.98%and 4.08%(P＜0.05),respectively.The serum TP and GLB levels of Sunzhi chickens in the CPP groups of 240 and 480 mg/kg significantly increased(P＜0.05),while the TNF-α levels significantly decreased(P＜0.05).The IgG levels in the CPP groups of 120-480 mg/kg significantly increased(P＜0.05),and the IL-1 β levels in the CPP group of 240 mg/kg significantly increased(P＜0.05).CPP did not have a significant effect on the levels of Alb,IgA,IgM,IFN-γ,and IL-10(P＞0.05).The a * value of chest muscle in broiler chickens was significantly upregulated(P＜0.05)at 240 and 480 mg/kg CPP groups,while the L * value of leg muscle was significantly downregulated(P＜0.05),and the a * value was significantly upregulated(P＜0.05).The shear force of leg muscle was significantly downregulated(P＜0.05)at 120-480 mg/kg CPP groups.(Experimental conclusion)Adding 480 mg/kg can promote the growth and development of Sunzhi chickens,enhance immunity,and improve meat quality.
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