Effect of Nutrients on Laying Rate,Egg Quality,Blood Biochemical Indices and Certain Mineral Elements of Laying Hens under Free Range System |
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| Authors: | ZHANG Xin-yue QI Chao ZHAO Hai-xia JIN Xiao-tong GUO Ming-xin HUA Jing ZHANG Shu-ping |
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| Institution: | College of Biological Science and Engineering, Beijing University of Agriculture, Beijing 102206, China |
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| Abstract: | This study was conducted to investigate the effect of nutrients on laying rate, egg quality, blood biochemical indices and certain mineral elements of laying hens under free range system.100 laying hens with similar age and weight were respectively selected from each farm, Hantai, Heishanzhai, Tailing in Changping and Doushi, Liyuan in Shunyi poultry farm, and randomly allotted to 2 groups with 5 replicates per group and 10 hens per replicate.The control group was fed with corn as the main diet and test group was fed with corn as the main diet supplemented with appropriate of trace elements, vitamins and other nutrients.The trial lasted for 52 days.The results showed that the laying rate of test group was significantly higher than that of control group in different farm (P<0.05).The egg weight of test group was significantly higher than that of control group in Hantai, Doushi, Tailing and Liyuan (P<0.05).The protein height of control group was significantly higher than that of test group in Liyuan (P<0.05).The yolk color of test group was significantly higher than that of control group in Doushi and Liyuan (P<0.05).There were no significant differences in the egg index, shell thickness and average shell strength among all groups (P>0.05).The plasma contents of TP and TG of test group was significantly higher than that of control group in Heishanzhai (P<0.05).The content of Ca in egg of test group was significantly higher than that of control group in Hantai and Doushi (P<0.05), the contents of Cu and Mg of egg in Doushi and the contents of Mn and Fe of egg in Hantai of test group were significantly higher than that of control group (P<0.05), the content of Mg in egg of test group was significantly higher than that of control group in Heishanzhai (P<0.05).In conclusion, adding appropriate level of nutrients could improve the laying rate and the contents of Ca, Zn, Mg and other minerals in egg, increase the plasma contents of TP, TG and CHO, and significantly improve the nutritional status of laying hens. |
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| Keywords: | laying hens laying rate egg quality mineral element nutrients |
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