关键词: 猪, 铜, 生产性能, 回归方程

Abstract: The dynamic relationship between growth performance and dietary copper supplementation in the growing-finishing pigs were investigated in this study. In the experiment, sixty Duroc×Landrance×Yorkshire (DLY) piglets averaging 20 kg were assigned to five dietary treatment in a single factorial arrangement during 20~100 kg stage. Pigs received a diet containing about 0, 100, 200, 300, 400 mgCu/kg diet, respectively. The results show that the supplementation of 100~300 mgCu/kg diet can increase average daily gain (ADG) and decrease F/G. Compared to the control group, ADG increased by 7.67~10.59% (P>0.05), F/G is reduced by 4.58~11.76% (P>0.05). The regression equations of the ADG (y₁, g) and F/G (y₂) with the copper supplementation (x, mg/kg) is:y₁=737.21+0.9343x-0.0025x² (R²=0.900, P=0.100); y₂=3.1063-0.0036x+8.7×10^-6x² (R²=0.795, P=0.205). According to the regression equations, the highest ADG and F/G can be achieved when the copper supplementation are 223, 269, 147, 186 mg/kg and 300, 311, 158, 206 mg/kg in 20~35 kg, 35~80 kg, 80~100 kg and 20~100 kg stages.

Key words: pigs, copper, growth performance, regression equation