Effects of Dietary Methionine Level on Performance, Egg Quality and Serum Biochemical Indices of Beijing You Chickens during Peak Laying Period

  • ZHANG Qianqian ,
  • GENG Ailian ,
  • CHANG Cheng ,
  • ZHAO Yafang ,
  • ZHAO Xianghong ,
  • ZHANG Yu ,
  • WANG Haihong ,
  • CHU Qin ,
  • LIU Huagui
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  • 1. College of Animal Science and Technology, Shandong Agricultural University, Tai'an 271018, China;
    2. Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China;
    3. Beijing Sino-Agri U-Plus Biotechnogy Co., Ltd., Beijing 100094, China

Received date: 2021-08-23

  Online published: 2022-04-14

Abstract

This experiment was conducted to investigate the effects of dietary methionine (Met) levels on performance, egg quality and serum biochemical indices of Beijing You chickens (BYC) during peak laying period (27 to 34 weeks of age), so as to determine the dietary Met level during peak laying period, and to provide a basis for the feeding standards of BYC in the future. A single-factorial design was used. A total of 324 BYC laying hens at 26 weeks of age with no significant difference in body weight (P>0.05) were randomly selected. The birds were randomly divided into 3 groups with 6 replicates each, 6 cages per replicate and 3 hens per cage. Birds in each group were randomly fed one of three experimental diets, and the metabolizable energy (11.31 MJ/kg) and crude protein levels (15%) were the same, and the Met levels were 0.34%, 0.42% and 0.48%, respectively. Growth performance of BYC aged from 27 to 30 weeks, 31 to 34 weeks and 27 to 34 weeks was determined. Egg quality was measured at weeks 30 and 34. Serum immune and antioxidant indices were measured at week 34. The results showed as follows:1) dietary Met level did not affect average weekly feed intake and average weekly egg weight, feed to egg ratio, egg laying rate and mortality rate of BYC aged from 27 to 30 weeks and 31 to 34 weeks (P>0.05). Dietary Met level had the influence trend on egg laying rate of BYC aged from 27 to 34 weeks (P=0.056). Dietary Met level of 0.34% group had the highest average weekly egg weight, higher laying rate and lower feed to egg ratio aged from 27 to 34 weeks. 2) Dietary Met level significantly affected the albumen height and Haugh unit (HU) of 30-week-old BYC (P<0.05), and the albumen height and HU of 0.34% group were significantly higher than those of 0.42% group (P<0.05), but there were no significant differences compared with 0.48% group (P>0.05). Dietary Met level had the influence trend on the average weekly egg weight at 34 weeks of age during laying period (P=0.054), but had no significant effects on other egg quality indices (P>0.05). The eggshell strength, albumen height, HU, yolk color and egg grade of 0.34% group were the highest. 3) Dietary Met level had the influence trend on serum glutathion peroxidase activity of BYC at 34 weeks of age (P=0.052). When dietary Met level was 0.34%, the total protein, albumin contents and lysozyme activity in serum were the highest, urea nitrogen and malondialdehyde contents were the lowest, and total antioxidant capacity was the highest. Considering the results of performance, egg quality and serum biochemical indices, it is suggested that dietary Met level of 0.34% can meet the requirement of BYC during the peak laying period (27 to 34 weeks of age) under this condition.

Cite this article

ZHANG Qianqian , GENG Ailian , CHANG Cheng , ZHAO Yafang , ZHAO Xianghong , ZHANG Yu , WANG Haihong , CHU Qin , LIU Huagui . Effects of Dietary Methionine Level on Performance, Egg Quality and Serum Biochemical Indices of Beijing You Chickens during Peak Laying Period[J]. Chinese Journal of Animal Nutrition, 2022 , 34(4) : 2403 -2412 . DOI: 10.3969/j.issn.1006-267x.2022.04.035

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