Molecular Nutrition

Effects of Bacillus subtilis on Performance and Eggshell Quality of Laying Hens during Later Period of Laying

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  • 1. College of Animal Science and Technology, Gansu Agricultural University, Lanzhou 730070, China;
    2. Key Laboratory of Feed Biotechnology of Ministry of Agriculture, National Engineering, Research Center of Biological Feed, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China

Received date: 2017-10-16

  Online published: 2018-04-03

Abstract

This experiment was conducted to study the effects of Bacillus subtilis on performance and eggshell quality of laying hens during later period of laying. Four hundred and twenty 52-week-old Hy-Line brown laying hens with similar egg production rate and bodyweight were randomly divided into 4 groups with 7 replicates per group and 15 hens per replicate. The control group was fed a corn-soybean meal basal diet, and the experimental groups were fed basal diets supplemented with 200, 400 and 800 mg/kg Bacillus subtilis, respectively. The pre-experimental period lasted for 1 week, and the experimental period lasted for 12 weeks. The results showed as that compared with the control group:1) diet supplemented with 200, 400 and 800 mg/kg Bacillus subtilis had no significant effects on the egg production rate and average egg weight (P>0.05), but significantly decreased the average daily feed intake (P<0.05); diet supplemented with 400 and 800 mg/kg Bacillus subtilis significantly decreased the ratio of feed to egg (P<0.05). 2) Diet supplemented with 200, 400 and 800 mg/kg Bacillus subtilis significantly increased the eggshell thickness (P<0.05), but significantly decreased the broken egg rate (P<0.05); diet supplemented with 800 mg/kg Bacillus subtilis significantly increased the eggshell strength and eggshell percentage (P<0.05). 3) Diet supplemented with 800 mg/kg Bacillus subtilis improved the eggshell ultrastructure, and significantly increased the eggshell calcium content (P<0.05). In conclusion, diet supplemented with Bacillus subtilis can improve the performance, improve eggshell quality, and reduce broken egg rate of laying hens during later period of laying. The optimal supplemental level of Bacillus subtilis is 800 mg/kg in the present study.

Cite this article

CUI Chuangfei, WANG Jing, QI Guanghai, ZHANG Haijun, SHI Zhaoguo, WU Shugeng . Effects of Bacillus subtilis on Performance and Eggshell Quality of Laying Hens during Later Period of Laying[J]. Chinese Journal of Animal Nutrition, 2018 , 30(4) : 1481 -1488 . DOI: 10.3969/j.issn.1006-267x.2018.04.032

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