A comparative study on productive, reproductive and ovarian features of repeat breeder and normal cyclic cows in the selected areas of Bangladesh
Objective: The research was accomplished to appraise the productive and reproductive physiology of repeat breeder (RB) cows and compare to normal cyclic (NC) cows.
Methodology: A total of 366 RB cows were surveyed from 1859 crossbred and indigenous cows using a questionnaire upon positive sampling of RB syndrome in dairy farms throughout the selected areas of Bangladesh. Out of 366 RB cows, 170 were randomly selected, which were at day 0 of estrous cycle. To compare the physiological characteristics, 170 NC cows at day 0 of estrous cycle were also selected randomly.
Results: Results showed that age, BCS, and parity were higher in RB cows than NC cows. Survey on productive characteristics illustrated that milk production (P<0.05) and lactation length (P<0.01) was significantly higher in RB cows compared with NC cows. The study on reproductive features exposed that age at puberty and the first calving age was significantly (P<0.01) lower but the number of service, gestation length, calving interval, and voluntary waiting period were significantly (P<0.01) higher in RB cows than that of NC cows. Ovarian physiological characteristics revealed that estrus duration was significantly (P<0.05) lower in RB cows in comparison with NC cows. In addition, the largest follicular diameter was significantly (P<0.01) lower but vaginal electrical resistance (VER) was significantly (P<0.01) higher in RB cows compared with NC cows at day 0 of the estrous cycle.
Conclusion: Results indicate hurly-burly characteristics of ovarian physiology in RB cows. This study could help veterinarians and researchers to define various risk factors associated with RB cows.
Copyright (c) 2018 Mir Md. Iqbal Hasan, Md. Maruf Hassan, Rupam Chandra Mohanta, Md. Abu Haris Miah, Mohammad Harun-Or- Rashid, Nasrin Sultana Juyena
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