Ovarian activity and vaginal resistance in postpartum anestrus Sahiwal cows

摘要

Postpartum anestrus Sahiwal cows (n=4) which had not shown the signs of estrus three months after parturition and did not show presence of corpus luteum in one of the ovary at two examinations made by rectal palpation 11 days apart were selected for present investigation. Ovaries of all the experimental animals were monitored at 4 days interval for 24 days by the use of Real time B-mode ultrasonography (Scanner 200 EMC/Pie Medical) for the development of ovarian follicle with 5 Mhz transducer. On each examination the diameter of the largest follicle in each ovary was measured. Vaginal mucus impedance was measured daily for 24 days with the help of vaginal probe and impedance meter. The mean follicular diameter at days 0, 4, 8, 12, 16, 20 and 24 were3.9±0.60, 6.72±1.60, 5.57±1.89, 6.72±1.75, 8.6±0.67, 7.97±0.65 and 10.23±0.87 mm respectively. Changes in VMI indicated a clear increasing and decreasing pattern at a very short interval with very high individual variation. Correlation (r) between VMI and follicular diameter was negative and significant (r = -0.83 P < 0.01). It was concluded by the present investigation that ovarian activity in prolonged postpartum anestrus cow has negative correlation of VMI with follicular diameter. VMI couldbe a cost and time effective means to determine the ovarian functional status in true anestrus postpartum animals, which are beyond the reach of rectal palpation.