REPRODUCTIVE AND PRODUCTIVE PERFORMANCE OF DAIRY COWS IN DIFFERENT UPAZILA OF DINAJPUR DISTRICT

Abstract

The aim of the present study was to evaluate the reproductive and productive performances of dairy cows in different upazila of Dinajpur district from July-December 2017. A total of 200 cows were selected to collect data in respect of age at puberty, age at first conception, age at first calving, time from calving to first estrus, time from calving to first service, calving interval, number of service per conception, milk yield through a pretested questionnaire. The significantly (p<0.05) highest age at puberty (23.9±4.0 months) was observed in Khansama, whereas the lowest (19.3±7.3 month) was observed in Chirirbondar. The cows of Khansama took significantly (p<0.05) longer time to obtain age at first conception (24.9. ±3.7 months), whereas the cows of Chirirbondar upazila needed shorter time to obtain the age at first conception (20.2±6.7 months).The significantly (p<0.05) highest age at first calving was observed in Khansama (34.9±3.7 months), whereas the lowest in Chirirbondar (30.2±6.7 months). There was no significant difference (p>0.05) from calving to first estrus of cows in different upazila. However, the cows of Khansama took the highest time from calving to first estrus (80.0±24.0 days) whereas the lowest (69.6±19.3 days) was observed in Dinajpur Sadar. Time from Calving to first service of cows in different upazila was not significantly (p>0.05) differed from each other. In Khansama the highest time from calving to first service (86.5±27.1 days) was observed, whereas the lowest in Birol upazila (78.6±14.7days). Though there was no significant differences (p>0.05) in calving interval of cows in different upazila. Therefore, in Khansama took the highest duration for calving interval (395.3±23.9 days) compared with the lowest calving interval observed in Dinajpur Sadar (381.0±34.8 days). Number of service per conception of cows was not significantly (p>0.05) differed from each other in different studied areas. However, the cows of Birol needed the highest number of service per conception (2.10±2.4) whereas lowest in Dinajpur Sadar (1.62±0.66). The ranges of service per conception were 1-17. Significantly (p<0.05) highest milk yield (2286.8±1598.9 L) was observed in Chirirbondar compared with the lowest (937.2±830.9 L) was observed in Khansama. In conclusion, the information generated from the study may be useful for farmers to improve the productive and reproductive efficacy of dairy farms in Dinajpur district.