State Key Laboratory of Agricultural Biotechnology

In order to get some direction and theoretical basement in the field of QTL identify for egg quality traits,genetic analysis was conducted to the CAU-BC resource population.Egg quality traits were measured and their phenotypic differences were compared,the heritability,estimation of the least number of samples required for identification of QTL was worked out,too.The results showed that FO of the two breed were there significant differences in egg quality traits and all traits in the F2 separate population are multi-peak distribution.The bias of their means between the FO and F2 generation suggest big major gene effects of these three traits:egg-shape index,Haugh unit,eggshell thickness.Heritability of Eggshell strength and the egg gravity was 0.25 and 0.27,respectively.Heritability of egg shape index,egg shell weight,Haugh unit,eggshell color,egg gravity,eggshell uuckness and egg weight were between0.35 to 0.49.Heritability of egg yolk weight was 0.68.Base on the heritability estimation,population size which needed for conduct a QTL identification reasearch was predicted between 34-324.The number of available individual of this rescource family is more than 1000,which is greatly exceeded the minimum requirement to locate the QTL of these relative traits,that means this resource family will provide sufficient information for die QTL identification works.