Abstract

The objective was to compare populations of antral and pre-antral ovarian follicles in Bos indicus and Bos indicus-taurus cows with high and low antral follicle counts. Nelore (Bos indicus, n=20) and Nelore X Angus (1/2 Bos indicus-taurus, n=20) cows were subjected to follicular aspiration without regard to the stage of their oestrous cycle (day of aspiration=D0) to remove all follicles ≥3mm and induce growth of a new follicular wave. Ovaries were examined by ultrasonography on D4, D19, D34, D49 and D64, and antral follicles ≥3mm were counted. Thereafter, cows were assigned to one of two groups: high or low antral follicular count (AFC, ≥30 and ≤15 antral follicles, respectively). After D64, ovaries were collected after slaughter and processed for histological evaluation. There was high repeatability in the numbers of antral follicles for all groups (range 0.77-0.96). The mean (±SD) numbers of antral follicles were 35±9 (Bos indicus) and 38±6 (Bos indicus-taurus) for the high AFC group and 10±3 (Bos indicus) and 12±2 (Bos indicus-taurus) follicles for the low AFC. The mean number of preantral follicles in the ovaries of Bos indicus-taurus cows with high AFC (116226±83156 follicles) was greater (p<0.05) than that of Bos indicus cows (63032±58705 follicles) with high AFC. However, there was no significant correlation between numbers of antral and preantral follicles.

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