Abstract
1. The relationships between egg weight or age of breeder quails (Coturnix coturnix japonica) and 1‐d‐old chick weight were determined.
2. Significant correlations were found between egg weight and chick weight (R2 = 0.32) and age and chick weight (R2 = 0.86). Thus, hatching weight was influenced more by the age of breeder quails than by egg weight as such.
3. Chick weight was accurately predicted by the use of age as a single independent variable; egg weight did not explain any further variation.