›› 2018, Vol. 45 ›› Issue (12): 3431-3437.doi: 10.16431/j.cnki.1671-7236.2018.12.015

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Effects of Dietary Calcium Levels in Corn-soybean-phytase Diets on Production Performance and Egg Quality in Late Period of Jinghong 1 Laying Hens

LIU Guoqing1, ZHANG Xiong1, ZHANG Lei1, QIN Jinsheng2, ZHUO Mei2, HUANG Haibin2, ZHANG Jianyun1, JI Cheng1, MA Qiugang1   

  1. 1. State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China;
    2. Xinjiang Tiankang Feed Technology Co., Ltd., Urumqi 830011, China
  • Received:2018-04-25 Online:2018-12-20 Published:2018-12-21

Abstract:

In this experiment,suitable calcium requirements in Jinghong 1 commercial laying hens were studied through feeding experiments to provide certain basic data for the formulation of nutritional standards in Jinghong 1 commercial laying hens.Single-factor test design was used for the experiment.360 Jinghong 1 layers at age of 52 weeks were randomly divided into 4 treatments with 6 replicates per treatment and 15 layers per replicate.Corn-soybean-phytasebasic diets were fed in this experiment.Dietary calcium levels were 2.91%,3.94%,4.38%and 4.98%,respectively.And the trial period was 6 weeks.The number of laying eggs,egg weight and the number of unqualified eggs were recorded every day during the experiment,and the feed intake was counted by repetition every week.At the end of the experiment,3 eggs were taken from each replicate to measure egg quality.The results showed that:① Different calcium levels had no significant difference on egg production rate,average egg weight,daily egg production,average daily feed intake and feed-egg ratio (P>0.05).But feed-egg ratio and the average daily feed intake in the 3.94% group were lower than those in other groups,and the broken egg rate in the 3.94% treatment group was significantly lower than that in the 4.38% and 4.98% groups (P<0.05).②Different calcium level diets had significant effect on eggshell thickness (P<0.05).The 4.38% group was significantly higher than the 2.91% and 4.98% groups (P<0.05),and the 3.94% group was significantly higher than the 4.98% group (P<0.05).The eggshell intensity of 3.94% group was the highest,and the eggshell ratio in this group was the most suitable,but there was no significant difference among all the treatments (P>0.05).③Through establishing a regression relationship between eggshell thickness and dietary calcium levels,the optimal dietary calcium level was estimated to be 3.84%.Based on the results of this experiment,under the condition of feeding corn-soybean-phytasebasic diets,3.84% to 3.94% calcium level diets could improve egg shell thickness,increase egg weight and reduce broken egg rate in late period of Jinghong 1 laying hens,and were beneficial to the production performance.

Key words: calcium; jinghong 1; requirement; production performance; egg quality

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