Abstract
A reduction in brood size from two squabs to one reduced the inter-clutch interval of ring doves from 31 to 21 days. Development of, and parental behaviour towards, the squabs was not affected by how many there were. However, the reduction in brood size advanced behavioural interactions between males and females, with male cooing, in particular, being stimulated. Ring dove males and females have to interact behaviourally in order to stimulate ovulation. The data suggest that male courtship behaviour may influence the length of the inter-clutch intervals. Furthermore, the behavioural changes that males showed in relation to brood reduction may have contributed to the advancement of egg laying in females.
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