We believe that this is the first study to examine relationships between histological and surface populations of follicles in one ovary and superovulatory response of the other ovary in cattle. Clearly, we have demonstrated that cows that had a low response to superovulation with FSH-P had fewer primordial and tertiary follicles. These cows also had fewer total surface follicles, mainly attributable to fewer small (1-3 mm) and medium (3-7 mm) follicles. Moreover, cows that had fewer microscopic follicles had fewer small (1-3 mm) follicles and CL. Cheap Diskus Advair

The finding that the number of tertiary follicles (< 1 mm) was strongly positively correlated with superovulatory response (r = 0.68, p < 0.05) shows that the pool of follicles that are not yet at a stage that would respond to exogenous FSH may subsequently contribute in a linear manner to the responsive pool. These follicles do not represent the population of antral follicles that would be responding to FSH 48 h after unilateral ovariectomy, because Lussier et al. demonstrated that it takes about 42 days for the earliest antral follicles to grow to ovulatory size in cattle. This would seem to indicate that the pool of microscopic antral follicles is a good predictor of how an animal will respond to superovulation in the future.