饲粮铜添加水平对泰和乌骨鸡生产性能和组织黑色素含量的影响

Dietary Copper Supplemental Level Affects Performance and Melanin Content in Tissues of Taihe Silky Fowls

本试验旨在研究饲粮铜添加水平对1～28日龄泰和乌骨鸡生产性能和组织黑色素含量的影响。选用1日龄泰和乌骨鸡270只,随机分成6组,每组设3个重复,每个重复15只鸡。试验鸡分别饲喂在基础饲粮(铜含量为4.75 mg/kg)中添加0、5、15、30、60、125 mg/kg铜的饲粮,饲养至28日龄。结果表明:饲粮铜不同添加水平对1～28日龄泰和乌骨鸡平均日增重、平均日采食量和料重比均无显著影响(P>0.05),但适量添加可显著或极显著影响其血清、肝脏、肾脏、皮肤及肌肉的黑色素含量、酪氨酸酶活性(P<0.05或P<0.01),并呈现出随饲粮铜添加水平的提高先升后降的趋势。当饲粮铜添加水平为30 mg/kg时,泰和乌骨鸡血清和组织酪氨酸酶活性及黑色素含量达到峰值。由此可知,玉米-豆粕型基础饲粮中添加铜可提高泰和乌骨鸡组织黑色素含量,其适宜添加水平为30 mg/kg。

The aim of this study was to investigate the effects of dietary copper(Cu) supplemental level on performance and melanin content in tissues of Taihe silky fowls aged 1 to 28 days.A total of 270 one-day-old Taihe silky fowls were randomly allotted to 6 groups with 3 replicates per group and 15 birds per replicate.The birds were fed the corn-soybean meal based diet with 0,5,15,30,60 and 125 mg/kg Cu,respectively,and were raised to 28 days of age.The results showed as follows: the average daily gain(ADG),the average daily feed intake(ADFI) and the ratio of feed to gain(F/G) of Taihe silky fowls aged 1 to 28 days were not significantly influenced by dietary Cu supplemental level(P>0.05).However,the melanin content and tyrosinase activity in serum,liver,kidney,skin and muscle of Taihe silky fowls aged 1 to 28 days were significantly affected by dietary suitable Cu supplementation(P<0.05 or P<0.01).All above parameters tended to increase at first and then decrease with increasing Cu supplemental level,and peaked at 30 mg/kg supplementation.It is concluded that the supplementation of Cu in the diet can stimulate melanin biosynthesis of Taihe silky fowls,and the optimum supplemental level of Cu is 30 mg/kg.