RESEARCH PAPER

Effects of Glycine and Iron and Their Complex on Performance and Eggshell Quality of Laying Hens in Late Laying Period

  • SUO Feiya ,
  • MA Qiugang ,
  • ZHANG Jianyun ,
  • ZHAO Lihong ,
  • JI Cheng
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  • 1. Shanxi Yuncheng Animal Husbandry and Veterinary Development Center, Yuncheng 044000, China;
    2. State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China

Received date: 2021-06-04

  Online published: 2022-01-18

Abstract

This study was carried out to evaluate the effects of glycine, inorganic iron, glycine-inorganic iron and glycine chelated iron on performance and eggshell quality of Jinghong No.1 laying hens in late laying period, in order to obtain the most suitable addition form of glycine and iron. A total of 450 healthy Jinghong No.1 laying hens at 58 weeks of age were randomly allocated to 5 groups with 6 replicates per group and 15 hens per replicate. Hens in the control group were fed a corn-miscellaneous meal basal diet supplemented with 60 mg/kg inorganic iron (total iron content was 269.30 mg/kg), and those in experimental groups were fed the basal diet supplemented with 105 mg/kg glycine (glycine group), 85 mg/kg inorganic iron (inorganic iron group), 105 mg/kg glycine+85 mg/kg inorganic iron (glycine-inorganic iron group), and glycine chelated iron contained 85 mg/kg iron and 105 mg/kg glycine (glycine chelated iron group), respectively. The experiment lasted for 21 days after a 14-day adaption. The results showed as follows:1) the daily egg mass in all experimental groups was significantly higher than that in the control group (P<0.05). The average daily feed intake of laying hens in glycine-inorganic iron group was significantly higher than that in the other four groups (P<0.05). There were no significant differences in laying rate, average egg weight and feed to egg ratio among different groups (P>0.05). 2) There were no significant differences in eggshell strength, egg shape index and ratios of eggshell and yolk among different groups (P>0.05). The eggshell thickness in glycine chelated iron group and glycine-inorganic iron group was significantly higher than that in the other groups (P<0.05). 3) The density and flatness of eggshell cross section in glycine chelated iron group and glycine-inorganic iron group were better, the mastoid was closely arranged, and the crystal layer and palisade layer were relatively dense. On day 21 of the experiment, the effective mastoid thickness in eggshell cross section in inorganic iron group was significantly higher than that in glycine group, glycine-inorganic iron group and glycine chelated iron group (P<0.05). Compared with the control group, there were fewer cracks on eggshell external surface in glycine chelated iron group and glycine-inorganic iron group, and there was suspected accumulation of iron salt crystals on eggshell external surface in inorganic iron group. The fiber lines on eggshell inner surface in glycine chelated iron group and glycine-inorganic iron group were clear and orderly, and the fibers were closely arranged. In the control group, glycine group and inorganic iron group, the fiber arrangement on eggshell inner surface was loose, and there were many calcium carbonate crystals with obvious holes. In conclusion, dietary glycine-inorganic iron or glycine chelated iron containing 85 mg/kg iron and 105 mg/kg glycine has no significant effect on performance of laying hens in late laying period, but can improve eggshell quality.

Cite this article

SUO Feiya , MA Qiugang , ZHANG Jianyun , ZHAO Lihong , JI Cheng . Effects of Glycine and Iron and Their Complex on Performance and Eggshell Quality of Laying Hens in Late Laying Period[J]. Chinese Journal of Animal Nutrition, 2022 , 34(1) : 311 -320 . DOI: 10.3969/j.issn.1006-267x.2022.01.029

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