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Abstract
1. The effects of initial egg mass (IEM) and percentage mass loss during incubation (%ML) on hatchability of rock partridge eggs were investigated.
2. Eggs at the extremes of IEM had lower fertility and embryonic mortality.
3. Eggs at the extremes of %ML also had low fertility and hatchability was disproportionately reduced in eggs that had lost less mass during incubation.
4. Chick mass was a function of both IEM and mass lost during incubation.
5. In these respects rock partridge eggs are similar to that of other domesticated species of poultry.