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The quality and quantity of morphological and functional changes in ovarian tertiary follicles during their growth and development waves after synchromsation of oestrus and superovulation treatment is described. Within 48 and 120 h after injection of 125 mug cloprostenol simultaneous amplification of healthy non-atretic tertiary follicles as well as those recruited and selected as dominant on the ovarian surface was observed. The mean size of the largest growing dominant, i.e., ovulatory follicle significantly increased in ewes 24 and 48 h after cloprostenol administration compared not only to controls but also to experimental groups at 7.2 and 120 h after luteolytic treatment. Eleven (73.3%) goats and 45 (88.24%) ewes were found to respond to superovulatory treatment. Significant differences (P < 0.01) in ovulation response were noted between FSH (9.6 3.8) and PMSG (4.6 +/- 1.1) preparations in ewes. After superovulatory treatment the oestradiol-17β levels in follicular fluid of the selected dominant follicles increased significantly as compared to the large atretic follicles (P < 0.001). Oestrus synchromsation in ewes was carried out by cloprostenol induction of the new follicular wave. These results suggest that luteolysis has a key role both in the process of recruitment and in the induction of selection during folliculogenesis in ewes. Evaluation of the superovulatory response in ewes and goats demonstrates that FSH- and PMSG-based preparations affect follicles after recruitment in the process of selection.

Tertiary Follicular Growth Wave Dynamics after Oestrus Synchronization and Superovulation in Sheep and Goats