The Relation between Patterns of Ovarian Follicle Growth and Ovulation Rate in Sheep

Abstract

The number and growth rate of follicles within classes based on granulosa volume were determined for ovaries taken from groups of 4-5-year-old,. fine-wool Merino ewes drawn at different times of the year from a single strain flock maintained at Armidale, N.S.W:The breeding season of the flock normally extends from February to October and the mean ovulation rate rises from about 0·5 in February to about 1·8~1·9 during April-May.