cqvip:[Objectives]This study was conducted to investigate the relationship between cholesterol content in egg yolks and laying rate of laying hens.[Methods]Forty eight 450-day-old Hyline brown hens with uniform weight were randomly divided into 4 groups with 3 replicates in each group and 4 individuals in each replicate.Group 1 as the control check group(CK)was fed the basal diet;group 2 was fed the basal diet with the addition of 150 g/t of probiotics;group 3 was the basal diet+200 g/t lipase group;and group 4 was fed the basal diet with the addition of 150 g/t of probiotics and 200 g/t of lipase.The preliminary trial period was 10 d,and the experimental period was 30 d.[Results]The cholesterol content in the egg yolks of each test group was higher than that of the control group at 14 and 28 d after the drug administration.The laying rate of each test group began to increase at 14 d after the drug administration;and the laying rate of each test group increased significantly 28 d after the drug administration.It indicated that with the increase of cholesterol in egg yolks,the laying rate of laying hens increased significantly.[Conclusions]This study provides a certain experimental basis for culture production of laying hens.
展开▼
Tianjin Key Laboratory of Agricultural Animal Breeding and Healthy Husbandry College of Animal Science and Veterinary Medicine Tianjin Agricultural University Tianjin 300384 China;
