Abstract: In this experiment, egg shape index, egg weight loss in the incubation, allantoic and amniotic fluid volume were mensurated and analysed. The results showed that the egg shape index was correlative with the eggshell strengh, and the coefficient was 0.30. The eggshell strength was bigest when the egg shape index was from 0.800 to 0.819, more than and less than the range, the strength trended to descend. When the egg shape index was from 0.780 to 0.799, the egg weight loss was highest, but allantoic and amniotic fluid volume were smallest, more than and less than the range, the weight loss minished gradually, however allantoic and amniotic fluid volume increased little by little.

Key words: egg shape index; eggshell strength; egg weight loss; allantoic fluid; amniotic fluid