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Effect of egg weight on hatching rate of Hy-Line Brown chicken

BAI Jian;College of Life Science,Lvliang University;  
In the same feeding and management conditions,320 Hy-Line Brown laying eggs,which were classified into 4 groups by different weight [I(51.0 ~ 55.9)g,II(56.0 ~ 61.0)g,III(61.1 ~ 66.0)g,IV(66.1 ~70.6)g].Through studying the changes of fertilization rate and hatching rate of laying eggs,and comparing the eggs weight loss and weight loss rate,the main results of this study were as follows:(1)Hatchability of hatching eggs in Ⅱ group were respectively 9.81%,4.62% and 7.11% higher than that in Ⅰ, Ⅲ and Ⅳ group(P 0.05).Weightlessness rate of eighteen embryonic age in Ⅱ group were respectively 10.99%,5.33% and 34.82%lower than that in Ⅰ, Ⅲ and Ⅳ groups(P 0.05).(2)The best hatching egg weight range of Hy-Line Brown hen was 56.0 ~ 61.0 g.Beyond this range,egg fertilization rate and hatching rate were decreased.In order to ensure a better hatch results in the production practice,the appropriate weight of eggs were needed.(3)Throughout the incubation period of Hy-Line Brown laying eggs,the weight loss process was stable.There was a different in egg weight loss between different weight range of eggs selected to hatch.Typically,the higher the rate of weight loss,lower hatchability.
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