Abstract
Summary and Conclusion
Female ring doves were exposed to stimulation by the presence of males and of nesting material for varying periods of time, from 0 to 6 days, after which these stimuli were withdrawn. The birds' ovaries were examined 7 days after the beginning of the period of stimulation. Consideration of the incidence of atretic follicles and of completed ovulations leads to the conclusion that the presence of the mate and of nesting material stimulates growth of ova, and that this growth, and the progress of the ova toward ovulation, gradually become independent of the external conditions which originally stimulated it.
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