A comparative study on productive, reproductive and ovarian features of repeat breeder and normal cyclic cows in the selected areas of Bangladesh
Keywords:
Estrous cycle, Follicular diameter, Repeat breeder, VERAbstract
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.
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