Effect of high progesterone levels during the growing phase of the dominant follicle of wave 1 in ultrasonically monitored ewes

Abstract

The effect of high progesterone levels in the growth of the largest (dominant) follicle of Wave 1 was monitored by daily ultrasonography in Corriedale ewes. Progesterone treatment decreased the growing rate (P < 0.05), lengthened the static phase (P < 0.05) and tended to decrease the maximum diameter attained by the dominant follicle (P < 0.06). Key words: Ewes, ultrasonography, dominant follicle, progesterone, wave 1