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Abstract
1. The effects of the Sal‐s gene on ovarian morphology and the development of ovarian follicles in old laying hens before and after a forced moult were investigated by measuring and weighing the ovaries and follicles.
2. The laying rate of albinos was higher than that of nonalbinos before the forced moult but not afterwards. Hierarchical follicles in albino hens were smaller than those of nonalbinos before but not after the moult.
3. Growth intensity of hierarchical follicles was greater in albino hens before the moult, suggesting that follicular maturation was more rapid, possibly explaining the higher egg production observed.
4. All differences between genotypes disappeared after the moult, suggesting that the state of the ovary before a moult is independent of that afterwards.