Abstract: The aim of this experiment was to study the effects of 4 kinds of compound additives on performance and serum biochemical index in Black-bone silky fowl. One hundred and eighty chickens at the age of three hundred days were selected and randomly allocated to five treatment groups with three replicates, four diets containings four different compound additives (0.5%, 0.2%, 0.2% and 0.2%) and basic diet were given to feed these chickens for 78 days in order to. The results showed that laying rates were increased with diets of compound additives. When compared to control group, the laying rates of group 1, 2 and 4 were significantly increased by 6.09%, 13.82% and 6.57% (P<0.05), respectively. The values of average egg weight and the feed conversation rate of group 2 were the least in these treatment groups and were decreased by 2.05% and 12.5% compared to control group (P<0.05). The content of total cholesterol (TC) and glucose (GLU) of group 1 were decreased by 21.24% and 8.93% (P<0.05), and the content of creatine kinase (CK) was increased by 32.73% (P<0.05) compared to control group. There were no difference between group 2 and control group at all the serum biochemical index. The concentration of malonaldehyde (MDA) and CK of group 3 were lower than that of control group (P<0.05). The content of GLU of group 4 was increased by 13.97% (P<0.05) and the content of TC was decreased by 13.72% (P<0.05) compared to control group.

Key words: Black-bone silky fowl; productive performance; serum biochemical index