Molecular Nutrition

Tolerance of Laying Hens to Zinc-Methionine in Diet

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  • Key Laboratory of Animal Nutrition and Feed in East China of MOA, College of Animal Science, Zhejiang University, Hangzhou 310058, China

Received date: 2016-08-02

  Online published: 2017-02-17

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 between 350 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 glutamic-oxalacetic 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.

Cite this article

CHEN Nana, HE Junna, GUO Yang, LIU Bing, XIONG Pingwen, YU Dongyou . Tolerance of Laying Hens to Zinc-Methionine in Diet[J]. Chinese Journal of Animal Nutrition, 2017 , 29(2) : 511 -518 . DOI: 10.3969/j.issn.1006-267x.2017.02.018

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