| Autor: |
Silva‐Santos, KC, Siloto, LS, Santos, GMG, Morotti, F, Marcantonio, TN, Seneda, MM |
| Předmět: |
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| Zdroj: |
Reproduction in Domestic Animals; Feb2014, Vol. 49 Issue 1, p48-51, 4p |
| Abstrakt: |
Contents 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 ≥3 mm and induce growth of a new follicular wave. Ovaries were examined by ultrasonography on D4, D19, D34, D49 and D64, and antral follicles ≥3 mm 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 (116 226 ± 83 156 follicles) was greater (p < 0.05) than that of Bos indicus cows (63 032 ± 58 705 follicles) with high AFC. However, there was no significant correlation between numbers of antral and preantral follicles. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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