Abstract: 【Objective】 The aim of this experiment was to study the effects of different energy and protein levels of diets on the egg-laying performance,egg quality and hatching performance of Snowy Mountain chicken breeder hens,and to clarify the appropriate energy and protein levels of diets during the laying period. 【Method】 3 150 healthy Snowy Mountain chicken breeder hens with similar body weight at 22 weeks of age were selected and randomly divided into 9 groups according to a 3×3 two-factor experimental design with 3 energy levels (11.09,11.51,and 11.92 MJ/kg) and 3 protein levels (14.50%,15.50%,and 16.50%),with 7 replicates in each group and 50 hens per replicate.The trial period was 14 weeks.The number of broken eggs,unqualified eggs and qualified eggs were counted during the test period,and at the end of the test,the relevant indexes of egg quality were measured, and the eggs were hatched,and hatching performance were determeared. 【Result】 ①Dietary energy and protein levels had a significant effect on the egg breaking rate of breeding eggs,at 22 to 25 weeks of age,it was decreased with the increase of energy level,and showed a trend of increasing and then decreasing with the increase of protein level,and at 26 to 35 weeks of age,it was increased with the increase of energy level,and decreased with the increase of protein level.There was no significant interaction between dietary energy and protein levels on indexes of egg-laying performance of Snowy Mountain chicken breeder hens (P＞0.05).② Dietary energy level had no significant effect on the indicators related to the quality of breeding eggs (P＞0.05).Dietary protein level had a significant effect on the egg shape index and egg shell thickness of breeding eggs (P＜0.05),and the egg shape index of the low protein group was significantly higher than that of the medium protein group (P＜0.05),and the egg shell thickness showed an increasing trend with the increase of protein level.There was no significant interaction between dietary energy and protein levels on indices of Snowy Mountain chicken breeding egg quality (P＞0.05).③Dietary energy level had a significant effect on the hatchability of incubated eggs,fledgling rate and fertilized egg hatchability of breeder hens (P＜0.05),and the hatchability of incubated eggs,fledgling rate of the medium energy group was significantly higher than those of the low and high energy groups (P＜0.05).Dietary protein level had a significant effect on the embryo death rate and fertilized egg hatchability of breeder hens (P＜0.05),and the embryo death rate of the high protein group was significantly higher than those of the medium and low protein groups (P＜0.05),and the fertilized egg hatching rate in the medium protein group was significantly higher than that in the low protein group (P＜0.05).There was a significant interaction between dietary energy and protein levels on the hatchability of incubated eggs (P＜0.05). 【Conclusion】 Considering all the indexes of laying performance,egg quality and hatching performance of Snowy Mountain chicken breeder hens,it was recommended that the appropriate energy level of Snowy Mountain chicken breeder hens during laying period should be 11.51 MJ/kg,and the protein level should be 16.50%.

Key words: Snowy Mountain chicken; nutrient level; laying performance; egg quality; hatching performance