Ovulatory Response of the First Follicular Wave Growing and Regressing Phase Follicle For GnRH Administration in Cyclic Buffaloes
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Date
2010-09
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Abstract
The aim of present study was to determine
the ovulatory response of growing and regressing
phase of the fi rst follicular wave after GnRH
injection in cyclic buffaloes. Follicular dynamics
were studied using ultrasonography in six graded
Murrah buffaloes for two consecutive oestrous
cycles. Out of twelve normal cycles studied, 58.33
percent had two waves, and 41.69 percent had
three waves. The duration of the growth phase of
the fi rst wave dominant follicle in two-wave and
three-wave oestrous cycles was 8.00±1.34 days
and 6.40±0.92 days, and the regression phase was
10.00±0.96 days and 8.00±1.18 days respectively.
In Murrah graded buffaloes, day 6 and day 10 of
the oestrous cycle were considered as the growth
phase and the regression phase of the fi rst wave
dominant follicle. The buffaloes used to study
normal oestrous cycle were administrered GnRH
on the growth phase and the regression phase of
the fi rst wave dominant follicle. The percentage of
buffaloes ovulating in the growth phase was 75.00,
and that in the regression phase was 16.67. It was
concluded, that the ovulatory response was higher
in the growth phase of the fi rst wave dominant
follicle after GnRH injection.
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Keywords
Veterinary Science, Animal Reproduction, Gynaecology and Obstetrics