SERVICE PERIOD AND CALVING INTERVAL AS INDICES OF REPRODUCTIVE PERFORMANCE OF COWS UNDER FIELD CONDITIONS

Document Type : Original Article

Authors

1 Department of Animal Reproduction Faculty of Veterinary Science, University of Agriculture, Faisalabad (Pakistan)

2 Department of Medicine and surgery, Faculty of Veterinary Science, University of Agriculture, Faisalabad (Pakistan)

Abstract

Data on 430 artificially inseminated and 257 naturally bred cows was used to determine the service period and calving interval. Combined together the service period mean = S. E. was calculated to be 160.5 = 3.55 and calving interval (mean = S. E.) to be 400.88 = 5.64 days. The service period and calving interval for the artificially inseminated cows were 152.73 = 4.74 and 387.24 = 7.50 days respectively. The corresponding values for naturally bred cows were 182.45 = 3.80 and 423.69 = 8.11 days respectively. The artificially inseminated cows had shorter service period and calving interval. The possibility to reduce service period and calving interval 1st discussed.

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