43-63日龄黄羽肉鸡锌需要量的研究  

Zinc Requirement of Yellow Broilers from Forty-Three to Sixty-Three Days of Age

作　　者：蒋宗勇[1] 刘小雁[1] 蒋守群[1] 周桂莲[1] 林映才[1] 陈芳[1] 马现永[1] 

机构地区：[1]广东省农业科学院畜牧研究所/农业部动物营养与饲料(华南)重点开放实验室,广州510640

出　　处：《中国农业科学》2010年第20期4295-4302,共8页Scientia Agricultura Sinica

基　　金：农业部/财政部国家肉鸡产业技术体系项目(nycytx-42-G2-01);农业公益性行业科研专项(nyhyzx07-038)

摘　　要：【目的】研究日粮锌添加水平对黄羽肉鸡生长性能、抗氧化机能、免疫功能、组织锌沉积等的影响,探讨43—63日龄黄羽肉鸡的锌需要量。【方法】选用43日龄健康的快大型岭南黄羽肉公鸡1080只,根据体重随机分成6组,每组6个重复,每个重复30只鸡。处理1(空白对照组)为基础日粮,锌水平为18mg·kg-1,处理2、3、4、5、6分别在基础日粮上添加20、40、60、80、120mg·kg-1锌。试验周期为21d。【结果】在本试验条件下,日粮添加锌对鸡生长性能无显著影响(P>0.05)。添加锌显著提高鸡血清GSH-Px、CuZnSOD、AKP活性(P<0.05),显著增加血清GSH含量、血清及胫骨Zn含量、血清及肝脏MT含量(P<0.05),其中添加60mg·kg-1锌改善血清AKP活性和胫骨Zn含量效果最佳。日粮添加20—40mg·kg-1锌显著提高鸡胸腺指数,添加20—80mg·kg-1锌显著提高鸡法氏囊指数(P<0.05),但日粮添加锌对63日龄鸡脾脏指数、肝脏CuZnSOD活性和胫骨灰分含量均无显著影响(P>0.05)。【结论】仅考虑生长性能,玉米豆粕型日粮不需添加锌;以血清AKP活性、胫骨Zn含量为衡量指标,43—63日龄黄羽肉鸡日粮锌适宜水平为78mg·kg-1。通过非线性回归模型估测日粮锌适宜水平分别为81、60mg·kg-1。【Objective】An experiment was conducted to investigate dietary zinc level on growth performance,antioxidant capacity,immune function and zinc depositionin in Lingnan yellow broilers from 43 to 63 days of age,and to estimate the optimal dietary zinc level for yellow broilers.【Method】A total of 1080 43-day-old male broilers were randomly assigned to six dietary treatments with six replicates and thirty birds with each pen.The groups received the same basal diet supplemented with 0（control group） ,20,40,60,80 and 120 mg·kg^ -1 zinc from zinc sulfate（ZnSO4 . H2O） ,respectively.The trial lasted for 21 days.【Result】 Dietary zinc supplementation had no effect on the growth of broilers（P〉0.05） .Zinc supplementation increased the activities of GSH-Px,CuZnSOD and AKP in serum（P〈0.05） ,and significantly raised GSH content in serum,zinc concentrations in serum and tibia,MT content in serum and liver（P〈0.05） ,and addition with 60 mg·kg^ -1 zinc showed the best result for AKP activity in serum and zinc concentrations in tibia.Supplementation with 20 to 40 mg·kg^ -1 zinc significantly elevated thymus index,and addition of 20 to 80 mg·kg^-1zinc significantly improved the index of Bursa of Fabricius of broilers at 63d（P〈0.05） .Zinc addition had no effect on spleen index,CuZnSOD activity in liver and tibia ash percentage（P〉0.05） .【Conclusion】Only take consideration of growth performance of broilers,there＇s no need to supplement maize-soybean meal diet with zinc.Based on the criteria including AKP activity in serum and zinc concentration in tibia,the optimal supplemental zinc level estimated by variance analysis and multiple comparisons for broiler chicks was 78 mg·kg^-1for 43-63-day-old broilers,but the optimal supplemental zinc levels estimated byNLIN were 81 and 60 mg·kg^ -1,respectively.

关 键 词：锌 需要量 黄羽肉鸡 

分 类 号：S831[农业科学—畜牧学]