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Interrelationships between follicular size, estradiol-17β, progesterone and testosterone concentrations in individual buffalo ovarian follicles |
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P. Palta, N. Bansal, R. S. Manik, B. S. Prakash, M. L. Madan |
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| Abstract |
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This study was undertaken to measure the concentrations of estradiol-17棺, progesterone and testosterone, and to study their relationship with each other and with follicular size in individual buffalo ovarian follicles categorized as small (4 to 5 mm diameter), medium (6 to 9 mm diameter) and large (> 10 mm diameter). Steroid hormone concentrations varied markedly within follicles of each size category. Estradiol-17棺 concentrations (pmol/ml) were positively related to follicular diameter (R = 0.34, n = 308, p < 0.001) and were significantly higher (p < 0.001) in large (118.46 30.25), compared to those in medium follicles (50.32 8.29) which, in turn were significantly higher (p < 0.001) than those in small follicles (19.70 5.57). Progesterone and testosterone concentrations (pmol/ml) were not related to follicular diameter and were not different among small (330.99 27.32 and 17.68 2.44, respectively), medium (384.84 26.20 and 36.47 4.55, respectively) and large follicles (253.25 32.23 and 22.57 4.48, respectively). Estradiol-17棺 and progesterone concentrations were positively related (R = 0.39, n = 47, p < 0.01) in small, unrelated in medium and negatively related in large follicles (R = -0.59, n = 23, p < 0.01). There was no relationship between estradiol-17棺 and testosterone concentrations in follicles of all the three size categories. Progesterone and testosterone concentrations were positively related in large follicles (R = 0.57, n = 18, p < 0.02). There was no relationship between the two hormones in small and medium sized follicles. When the follicles with estradiol-17棺/progesterone molar ratios of > 1.00 were considered non-atretic, and the rest at different stages of atresia, 197/208 (95%) follicles were found to be atretic. |
| Keywords:
Buffalo; Estradiol-17棺; Follicles; Progesterone; Testosterone |
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