日粮添加高铜对幼龄水貂生长的影响

通过在幼龄水貂基础日粮中添加不同水平的铜探讨高铜日粮对水貂生长的影响.选取70只80日龄的健康水貂随机分成7组,每组10只,对照组水貂饲喂含铜5.98 mg/kg的基础日粮,6个试验组分别在基础日粮中添加210、220、240、250、260、310 mg/kg的铜,试验期60 d.饲养试验和生长速度测定分析结果表明：与对照组相比添加铜的1～4组对水貂的生长均有显著的促进作用,第4组水貂生长速度达到最大,第5组和第6组水貂生长速度减慢.由此可知：高铜日粮对幼龄水貂的生长有促进作用,日粮中添加250 mg/kg铜为幼龄水貂生长的最佳添加量,此时饲料中的总铜质量分数为255.98 mg/kg;日粮中添加过高剂量的铜会抑制水貂的生长.

Effect of High Copper Level Diets on Growth of Young Minks

This test was conducted to study the effects of different copper levels and high copper level diets on growth of young minks.Seventy healthy minks at the age of 80-day were randomly divided into 7 groups with 10 minks in each group.The minks in control group were fed with experimental diet with copper level of 5.98 mg/kg;Copper was supplemented into six treatment group diets with levels of 210 mg/kg,220 mg/kg,240 mg/kg,250 mg/kg,260 mg/kg and 310 mg/kg,respectively.The experiment lasted for 60 days.According to the examination and analysis of the minks＇ growth,the results showed that：the growth of minks in group 1,group 2,group 3 and group 4 were higher than those in control group;the growth of minks in group 4 was the highest,the growth of minks in group 5 and group 6 reduced.In conclusion,when the diet was supplemented with 250 mg/kg copper and the copper level of diet arrived at 255.98 mg/kg,the growth of young minks was optimal,excess copper in diet would inhibit the growth of minks.