Effects of different energy and oil level on laying performance and serum biochemical indexes in Hy-line brown laying hens
In order to study the effects of dietary energy(metabolizable energy)and oil consumption on laying performance and serum biochemical indexes of Hyline brown laying hens at late laying stage,egg quality of laying hens fed with different energy and oil was analyzed.1080 Hyline brown laying hens at 30 weeks of age were randomly divided into 4 groups(A,B,C and D group)with 6 replicates per group.The feed of the hens from A to D group included 11.10,11.10,11.30,11.30 MJ/kg energy and 1％,2.5％,1％,2.5％fat respectively.At 53 weeks of age,eggs were randomly selected from each replicate for egg quality,lipid metabolism and immune performance measurements.The results showed that the laying rate and egg production of C group were 2.08％and 2.59％higher than those from A group(P＜0.05),and the laying rate and egg production of D group were 2.50％and 2.71％higher than those from B group(P＜0.05).The yolk color of D group was 10.32％and 14.86％lower than that from B and C groups respectively(P＜0.05).The protein height and Huff unit of C group were 8.11％and 4.84％lower than those from A group(P＜0.05),and those from D group were 13.73％and 7.26％lower than those from B group(P＜0.05).The total cholesterol content in B group was 25.00％lower than that in A group,while the triglyceride content in B group was 81.40％higher than that in A group(P＜0.05),and the total cholesterol content in D group was 50.00％higher than that in B group(P＜0.05).The content of very low density lipoprotein in D group was significantly higher than that in B group by 133.33％(P＜0.05).The content of lysozyme in C group was 27.25％lower than that in A group(P＜0.05);The content of lysozyme in D group was significantly lower than that in B group(33.72％,P＜0.05).At the age of 53 weeks,9 laying hens were randomly selected from each replicate for serum biochemical indicators detection.The content of luteinizing hormone in serum of laying hens in C group was 114.38％higher than that in A group(P＜0.05).The content of vitellogenin in B group was 30.18％lower than that in A group(P＜0.05).In conclusion,diets with high energy and fat could improve laying performance and increase egg production,but decrease egg quality;Although low energy and low fat feed produces less eggs,it could guarantee the freshness of eggs and better egg quality.
Hy-line brown laying hensfeed metabolizable energyfeed oillaying performance
万方数据
维普
