0～21日龄肉仔鸡饲粮中锌适宜水平研究  

An Optimal Dietary Zinc Level for 21-day-old Broiler Chicks

作　　者：黄艳玲[1] 吕林[1] 李素芬[2] 罗绪刚[1] 刘彬[1] 

机构地区：[1]中国农业科学院北京畜牧兽医研究所矿物元素营养研究室 [2]河北科技师范学院,秦皇岛066004

出　　处：《畜牧兽医学报》2008年第7期900-906,共7页ACTA VETERINARIA ET ZOOTECHNICA SINICA

基　　金：国家973项目(2004CB117501);动物营养学国家重点实验室开放课题(2007KLAN005)

摘　　要：本文研究了不同水平无机锌对肉仔鸡生长性能、含锌酶活性及组织锌含量的影响，并对每一指标进行曲线拟合（二次曲线与渐近性），从中筛选合适的指标以确定肉仔鸡实用饲粮中锌的适宜水平。选用1日龄AA肉公鸡384只，随机分为8个处理组，每个处理6个重复，分别饲喂玉米-豆粕型基础饲粮（对照组）和锌添加水平为20、40、60、80、100、120 和140 mg/kg （硫酸锌）的饲粮, 试验期21 d。结果表明：（1）随饲粮锌水平的增加日增重和采食量有显著增加（P〈0.05），添加20 mg/kg锌组鸡的日增重和采食量显著高于对照组；（2）血浆5′-核苷酸酶活性随饲粮锌含量增加呈明显的二次曲线变化（P〈0.01），估测的锌适宜添加水平为52.13 mg/kg；（3）胰脏锌与胫骨锌含量随饲粮锌水平的增加呈渐近线上升趋势（P〈0.01），以此2指标确定的锌适宜添加水平分别为30.78与33.86 mg/kg；（4）含锌酶中碱性磷酸酶（AKP）及铜锌超氧化物歧化酶（CuZnSOD）活性以及肾脏锌含量随饲粮锌水平变化没有显著变化（P〉0.10），表明上述指标均不适宜用来估测锌适宜水平。以上结果表明，0～21日龄，肉仔鸡饲粮中锌的适宜水平约为80 mg/kg。An experiment was conducted to estimate the optimal dietary zinc （Zn） level for broiler chicks fed a corn-soybean meal diet. A total of 384 day-old male broiler chicks were assigned randomly into dietary treatments for 21 days. These treatments included a basal corn-soybean meal diet （28.37 mg Zn/kg diet） and the diets supplemented with 0, 20, 40, 60, 80, 100, 120 or 140 mg/kg of Zn in the form of reagent grade ZnSO4·7H2O. All treatments were replicated 6 times using 8 chicks per pen. Tissue Zn concentration and Zn metalloenzyme activity were analyzed for choosing suitable criterion to determine the optimal dietary Zn level for broilers. Regression analysis was performed to estimate optimal dietary Zn level in the presence of quadratic or asymptotic responses. Results showed that daily weight gain and daily feed intake were increased with dietary Zn level increased （P〈0.05）, and the maximum daily weight gain and daily feed intake were observed in the diet supplemented with 20 and 40 mg/kg of Zn （48.37 and 68.37 mg/kg total dietary Zn）. According to asymptotic model, the optimal Zn requirement of chicks from hatch to 21 d of age was 30.78 mg/kg for pancreas Zn and 33.86 mg/kg for bone Zn, respectively. Quadratic responses were exhibited by serum 5＇-nucleotidase （5＇-NT） activity, resulting in total optimal dietary levels of 52.13 mg/kg. Based on the results, the optimal dietary Zn level of chicks from hatch to 21 d of age is 80 mg/kg.

关 键 词：锌 肉仔鸡 适宜供给量 

分 类 号：S832.5[农业科学—畜牧学]