TRANSRECTAL DOPPLER SONOGRAPHY OF OVARIAN STRUCTURES AND UTERUS DURING ESTROUS CYCLE IN DAIRY COWS
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Date
2020-09-19
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CHKHPKV Palampur
Abstract
The study was conducted atInstructional Livestock Farm Complex, ChaudharySarwan Kumar Himachal Pradesh Agricultural University, Palampur. Ten dairy cows were selected for research and subjected to sonographic examination of ovarian structures from the day of estrus till completion of one estrous cycle using B-mode and color Doppler mode ultrasonography. Developmental pattern of follicles and corpus luteum during two- and three-follicular waves of estrous cycle were studied. The per cent vascularity of corpus luteum during different luteal phases and blood flow to uterus was evaluated based on the analysis of Doppler haemodynamic indices at an interval of 48 hours during an estrous cycle.
Two-wave estrous cycle was more prevalent in dairy cows as compared to three-wave estrous cycle and there was no significant difference (p>0.05) between the diameter of dominant follicle during different waves of two- and three-wave estrous cycle. Corpus luteum diameter and vascularity were significantly higher (p<0.01-0.05) during mid-luteal phase as compared to early and late luteal phase except in three-wave estrous cycle. Corpus luteum vascularity percentage was significantly higher in dairy cows (p<0.05) during late luteal phase in three-wave cycle as compared to two-wave cycle who failed to conceive. Also, there was a significant correlation (p<0.05) between corpus luteum diameter and vascularity irrespective of follicular waves and different luteal phases. A significant difference (p<0.01-0.05) between the recorded haemodynamic indices of middle uterine artery ipsilateral and contralateral to pre-ovulatory follicle was recorded on the day of estrus, however, this difference was found to be non-significant (p>0.05) with the progression of estrous cycle into luteal phase.