日粮铜水平对猪生长性能影响的研究

60头军牧 1号生长猪 (19.2 6± 1.2 0kg) ,随机分成 6组 ,公母各半。基础饲料为玉米 -豆粕型饲料。使用硫酸铜作为铜源 ,对照组铜添加浓度为 0mg/kg ,试验各组铜添加浓度为 10 0、15 0、2 0 0、2 5 0和 30 0mg/kg。试验开始时称重 ,之后每隔 2 0d称重一次。测定长性能指标。试验结果如下 :在日粮中添加不同水平的铜 (≥15 0mg/kg和≤ 30 0mg/kg)可明显提高平均日增重 (ADG) ,降低料重比 (F/G)。但增重效应表现出明显的阶段性差异 ,前期 (0d～ 6 0d)效果优于后期 (6 0d～ 10 0d)。整个试验期 ,试验组与对照组相比 ,ADG平均提高 9.9% ,增幅在 5 %～ 14 % ,其中以 2 0 0和 2 5 0mg/kg铜组最佳 ,分别达到 72 0 .77g/d(P <0 .0 1)和 72 5 .8g/d(P <0 .0 1) ;试验组比对照组F/G平均降低了 5 .4 % ,降幅为 3%～ 8% ,其中以 2 0 0和 2 5 0mg/kg铜组最低 ,分别为 3.0 8(P <0 .0 1)和 3.0 6 (P <0 .0 1)。采食量未见有显著变化 (P >0 .0 5 )。本试验结果表明 :15 0mg/kg～ 30 0mg/kg铜添加量对生长猪具有明显促生长作用 ,其中以 2 0 0和 2 5 0mg/kg铜组最佳

The Effects of Different Levels of Copper in Diets on the Growth Performance in Growing Pigs

This experiment using 60 "Junmu No.1" pigs (average initial weight of 19.26 kg) was conducted to examine the effects of feeding different levels of dietary Cu 2+ from copper sulfate (CuSO4) on growth performance. Dietary treatments were 0 (4.6 mg/kg of Cu 2+ in basal diet), 100, 150, 200, 250, or 300 mg/kg of supplemental Cu 2+ from CuSO4. Pigs were allotted by weight, sex, and given ad libitum access to corn-soybean feed and water during the 100-d trials. Pigs were weighted and pen feed intakes were recorded on d 0, 20, 40, 60, 80, and 100 of the trial. Overall, absolute weight (AW), average daily gain (ADG) and feed:gain (F/G) were improved by feeding 150, 200, 250, or 300 mg/kg of Cu as CuSO4 during the growing stage (live weight 20-60 kg). However, different levels of Cu 2+ in diets showed no effect on ADG and F/G during the finishing stage (live weight 60 kg-90 kg). The addition of 200 and 250 mg/kg of Cu improved (P less than .01) performance (ADG attained 720.7 g/d and 725.8 g/d, AW attained 90.81 kg and 92.02 kg, F/G attained 3.08 and 3.06, respectively) significantly throughout the 100-d trial. Supplementation of 100 and 0 mg/kg of Cu 2+ (control group) did not affect pig performance. Feed intake was not affected by adding Cu 2+ in the diets. The results showed that addition of 150~300mg/kg of Cu 2+ (sulfate) play a role of stimulating growth in pig with living weight ranging from 20kg to 60kg, and addition of 200mg/kg or 250mg/kg of Cu 2+ has made the greatest improvement in growth performance