Effects of ZnSO4 and Zinc Methionine on Performance, Egg Quality and Antioxidant Ability of Laying Hens in Late Laying Period

ZHANG Yanan; QI Xiaolong; WU Shugeng; ZHANG Haijun; YUE Hongyuan; WANG Jing; QI Guanghai

doi:10.3969/j.issn.1006-267x.2013.12.013

2013 , Vol. 25 >Issue 12: 2873 - 2882

DOI: https://doi.org/10.3969/j.issn.1006-267x.2013.12.013

Poultry Nutrition

Effects of ZnSO₄ and Zinc Methionine on Performance, Egg Quality and Antioxidant Ability of Laying Hens in Late Laying Period

ZHANG Yanan ,
QI Xiaolong ,
WU Shugeng ,
ZHANG Haijun ,
YUE Hongyuan ,
WANG Jing ,
QI Guanghai

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Key Laboratory of Feed Biotechnology of Ministry of Agriculture, Feed Research Institute of the Chinese Academy of Agricultural Sciences, Beijing 100081, China

Received date: 2013-06-07

Online published: 2013-11-19

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Abstract

This experiment was conducted to study the effects of different levels and sources of Zn on performance, egg quality and antioxidant ability of laying hens in late laying period. Five hundred and four 54-week-old healthy Hy-Line laying hens with the same laying rate and similer weight were randomly divided into 7 groups with 6 replicates per group and 12 hens per replicate. The pre-trial period lasted for 4 weeks and trial period lasted for 6 weeks.The laying hens were fed a Zn deficiency basal diet with Zn level at 29.07 mg/kg for pre-trial period. In trial period, the laying hens were randomly allocated into one of the 7 dietary treatments: basal diet (as control) and trial diets supplemented with ZnSO₄ and Zinc methionine (the basal diet supplemented levels of Zn were 35, 70, 140 mg/kg). The results showed as follows: 1) the Zn sources did not significantly affect the laying rate, average daily feed intake and the ratio of feed to egg (P>0.05), but the Zn levels were significantly affect the average egg weight (P<0.05), and the average egg weight of 35 mg/kg Zn group was significantly higher than that of 70, 140 mg/kg Zn groups (P<0.05); 2) the eggshell thickness was significantly affected by the different levels and sources of Zn, and the best group was 140 mg/kg Zinc methionine group; the album height and Haugh unit were significantly improved compared with control group after 3 weeks experiment (P<0.05), but there were no significant difference after 6 weeks experiment (P>0.05); the Zn sources had no effects on eggshell strength and egg yolk color (P>0.05); the ANOVA showed that the best group of egg quality was 70 mg/kg ZnSO₄ group; 3) the activities of total superoxide dismutase (T-SOD) and Cu/Zn-superoxide dismutase (Cu,Zn-SOD), total antioxidant capacity (T-AOC) and the ability of inhibiting superoxide anion both in serum and liver were significantly increased by different sources and different levels of Zn (P<0.05), and the best group was 70 mg/kg ZnSO₄ group. In conclusion, the Zn sources do not significantly affect performance, but can improve egg quality and antioxidant capacity of laying hens in some content. The best supplemental level and source of Zn are 70 mg/kg and ZnSO₄ in the present study.

Key words： Zn; laying hens; performance; egg quality; antioxidant

Cite this article

ZHANG Yanan , QI Xiaolong , WU Shugeng , ZHANG Haijun , YUE Hongyuan , WANG Jing , QI Guanghai . Effects of ZnSO₄ and Zinc Methionine on Performance, Egg Quality and Antioxidant Ability of Laying Hens in Late Laying Period[J]. Chinese Journal of Animal Nutrition, 2013 , 25(12) : 2873 -2882 . DOI: 10.3969/j.issn.1006-267x.2013.12.013

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