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An experiment was conducted with 546 Japanese breeder quail to determine the effect of age and egg weight on day-old chick weight over a 16-wk reproduction period. Weight of chicks hatched from the same or different size eggs was found to be affected by parental age. The largest increase in chick weight occurred after 10 wk of age. It was found that egg weight did not affect the hatching weight if egg weight was above 11 g.