动物营养学报2017，Vol.29Issue(2)：511-518,8.DOI:10.3969/j.issn.1006-267x.2017.02.018
蛋鸡对饲粮中蛋氨酸锌的耐受性研究
Tolerance of Laying Hens to Zinc-Methionine in Diet
摘要
Abstract
This experiment was conducted to determine the tolerant dosage of zinc-methionine supplementation in diet through evaluating its effects on performance, hematology indices and histopathological changes of laying hens.Five hundred and forty healthy 20-week-old Hy-Line white laying hens with similar body weight and laying rate were randomly allocated into 6 groups with 6 replicates per group and 15 birds per replicate.Birds were fed basal diets supplemented with 0 (control), 70 (the recommended available dose, RAD), 140 (two folds of RAD), 350 (five folds of RAD), 700 (ten folds of RAD) and 1 400 mg/kg (twenty folds of RAD) zinc-methionine, respectively.The trial lasted for 8 weeks.The results showed as follows : 1) compared with the control group, daily egg mass and laying rate were significantly increased and the ratio of feed to egg was significantly reduced in 70 and 140 mg/kg groups (P<0.05);there was no significant difference between350 or 700 mg/kg groups and control group in the above indices (P>0.05);compared with 0 to 700 mg/kg zinc-methionine, dietary supplemented with 1 400 mg/kg zinc-methionine significantly reduced daily egg mass and laying rate (P<0.01), and increased the ratio of feed to egg (P<0.01).2) Dietary zinc-methionine supplementation had no significant effects on blood routine parameters (P>0.05).3) Compared with the control group, dietary supplemented with 70 to 700 mg/kg zinc-methionine had no significant effects on serum biochemical indices (P > 0.05), however, supplemented with 1 400 mg/kg zinc-methionine significantly increased the contents of glucose, uric acid, creatinine and total bilirubin and improved the activities of glutamicoxalacetic transaminase and alkaline phosphatase (P<0.01).4) Dietary supplementation with twenty folds of RAD (1 400 mg/kg) zinc-methionine damaged major organ tissues.It is indicated that the tolerant dosage of zinc-methionine in laying hens diet is 700 mg/kg.[Chinese Journal of Animal Nutrition, 2017, 29(2) :511关键词
蛋鸡/蛋氨酸锌/耐受性Key words
laying hens/zinc-methionine/tolerance分类
农业科技引用本文复制引用
陈娜娜,何俊娜,郭阳,刘兵,熊平文,余东游..蛋鸡对饲粮中蛋氨酸锌的耐受性研究[J].动物营养学报,2017,29(2):511-518,8.基金项目
农业部饲料质量安全监管专项(2014) （2014）
东南沿海地区大学农业科技服务技术集成与示范(2013BAD20B02) （2013BAD20B02）
