Effects of Stocking Density on Growth Performance,Slaughter Performance,Serum Biochemical and Immune Indexes of Xuefeng Black Bone Chickens
This experiment was conducted to investigate the effects of stocking density on growth performance,slaughter performance,serum biochemical and immune indexes of Xuefeng black bone chickens.A total of 1 620 healthy 35-day-old Xuefeng black bone chickens were randomly assigned into 3 groups,low stocking density group(LSD group,60 birds/667 m2),medium stocking density group(MSD group,120 birds/667 m2)and high stocking density group(HSD group,180 birds/667 m2).The pre-trial period lasted for 7 days and the experimental period lasted for 78 days.The results showed as follows:1)the average daily weight gain and feed/gain of Xuefeng black bone chickens in the LSD group were significantly higher than those in the MSD and HSD groups(P＜0.05).2)Live weight before slaughter,dressings weight in the LSD group were significantly higher than those in the MSD and HSD groups(P＜0.05).3)In serum,aspartate aminotrans-ferase activity in the LSD group was significantly lower than that in the HSD groups(P＜0.05),alkaline phos-phatase activity in the LSD and MSD groups was significantly higher than that in the HSD group(P＜0.05);triglyceride content in the LSD group was significantly higher than that in the HSD group(P＜0.05);superox-ide dismutase activity in the HSD group was significantly lower than that in the LSD and MSD groups(P＜0.05).4)In serum,the contents of immunoglobulin G,immunoglobulin M,interleukin-2,interleukin-6,and tumor necrosis factor-α in the HSD group were significantly higher than those in the LSD and MSD groups(P＜0.05),and the content of immunoglobulin A in the MSD group was significantly higher than that in the LSD and HSD groups(P＜0.05).In conclusion,the stocking density of 60 birds/667 m2 can effectively improve the growth performance of Xuefeng black bone chickens,and at the same time ensure better slaughter perform-ance,antioxidant capacity and immunity.[Chinese Journal of Animal Nutrition,2024,36(7):4329-4338]
Xuefeng black bone chickensstocking densitygrowth performanceslaughter performanceser-um indexes
万方数据
维普
