摘要
通过研究日粮锌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,并对合适的指标建立相应的非线性回归模型,以探讨2242日龄黄羽肉鸡的锌需要量。选用22日龄健康、发育良好的快大型岭南黄羽肉鸡公鸡1 080只,根据体重随机分成6个组,每组6个重复,每个重复30只鸡,分别饲喂0、20、40、60、80、120 mg/kg锌添加水平日粮,试验期21日。结果表明：本试验条件下,日粮中添加锌对2242日龄试鸡生长性能无显著影响（P〉0.05）。日粮中添加锌显著提高了血清GSH-Px、CuZnSOD、AKP活性（P〈0.05）、GSH、Zn、MT含量、胫骨Zn及肝脏MT含量（P〈0.05）。日粮中添加锌对试鸡脾脏、胸腺、法氏囊指数、肝脏CuZnSOD活性和胫骨灰分含量均无显著影响（P〉0.05）。试验结果提示,仅考虑生长性能,玉米豆粕型日粮中不需添加Zn;以血清AKP活性、胫骨Zn含量为衡量指标,2242日龄阶段试鸡日粮锌适宜水平均为80 mg/kg,通过非线性回归模型估测的日粮锌适宜水平分别为83和70 mg/kg。
This experiment was conducted to investigate dietary zinc level on growth performance,antioxidant capacity,immune function and zinc deposition in yellow broilers from twenty-two to forty-two days of age,and to estimate the optimal dietary zinc level for yellow broilers.Totally,1 080 22-day-old male broilers were randomly assigned to six dietary treatments with six replicates and thirty birds in each replicate The groups received the same basal diet supplemented with 0,20,40,60,80 and 120 mg/kg zinc respectively.The feeding trial lasted for 21 days.The results showed that： Diet supplemented with zinc had no effect on the growth of broilers from 22 to 42 days of age（P〉0.05）;Zinc supplementation significantly increased the activities of GSH-Px,CuZnSOD and AKP in serum（P〈0.05） and significantly raised GSH content in serum,zinc concentration in serum and tibia,MT content in serum and liver（P〈0.05）;But Zinc addition had no effect on spleen index,thymus index and index of Bursa of Fabricius,CuZnSOD activity in liver and tibia ash percentage（P〉0.05）.Only considering growth performance of broilers,there was no need to supplement with zinc in maize-soybean meal diet.Based on AKP activity in serum and zinc concentration in tibia,the optimal supplemented zinc level estimated by variance analysis and multiple comparisons for broiler chicks were both for 80 mg/kg,but the optimal supplemented zinc level estimated by NLIN were 83 mg/kg and 70 mg/kg respectively.
出处
《中国粮油学报》
EI
CAS
CSCD
北大核心
2011年第6期66-72,共7页
Journal of the Chinese Cereals and Oils Association
基金
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)
关键词
黄羽肉鸡
锌
需要量
yellow broilers； zinc； requirement；
