饲料中铜含量对猪血清激素动态变化的影响

Effect of Feed Copper on the Dynamic Variations of Serum Hormone in Growing Pigs

将 6 0头平均体重为 (19.2 6± 1.2 0 )kg的生长猪 ,随机分成 6组。使用硫酸铜作为铜源 ,对照组铜添加水平为 0mg/kg;试验各组铜添加水平为 10 0 ,15 0 ,2 0 0 ,2 5 0和 30 0mg/kg。试验期为 80d ,测定生长性能及有关血清激素动态变化。试验结果表明 :铜添加量为 15 0～ 30 0mg/kg时 ,对 2 0～6 0kg生长猪具有明显的促生长作用 ,其中以 2 0 0 ,2 5 0mg/kg铜组最佳。同时 ,促生长剂量的铜还会影响机体的代谢激素 ,从而促进猪的生长。饲料中铜水平对血清相关激素动态变化的影响随铜添加水平的不同呈现明显的阶段性差异 ,其差异的显著性与铜的促生长效应是基本一致的。

An experiment involving 60 growing pigs (19.26±1.26)kg was conducted to determine the effect of the addition of Cu (4.6, 100, 150, 200, 250 and 300 mg/kg) on the growth performance and serum hormone level. Pigs were weighed and pen feed intakes were recorded once every twenty days, blood samples were collected for serum hormone analysis on the day just before the trial and the 20th, 40th, 60th and 80th day of the trial. The results of the feeding trial showed that pigs supplemented with 150mg/kg, 250 mg/kg and 300 mg/kg copper in basic diet increased average daily gain (ADG)( P <0.05) and decreased feed:gain (F/G) ratio ( P <0.05) on the growing stages (20～60 kg), different levels of copper addition have no effect on ADG and F/G on the finishing stages (60～90 kg). On the whole stages, the group of pigs supplemented with 200 mg/kg and 250 mg/kg copper grew fastest. In addition, the dynamic analysis of serum hormone level indicated that feeding high-Cu diet tended to increase serum hormone level, hence promoting pig growth. The influences of Cu on serum hormone levels were independent of F/G or growth in the experiment, which indicated a direct action of Cu on the growth regulatory system.