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

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 ４．７５ｍｇ／ｋｇ）中添加 ０、５、１５、３０、６０、１２５ｍｇ／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 ３０ｍｇ／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 ３０ｍｇ／ｋｇ。

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

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.