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Inheritance of age at first calving, calving interval and breeding efficiency in different lactations of Red Sindhi cows



Inheritance of age at first calving, calving interval and breeding efficiency in different lactations of Red Sindhi cows



Indian Journal of Animal Sciences 53(7): 750-752



Records were collected over a 20-yr period on 188 cows, and traits were corrected for the effect of 5-yr period. Age at 1st calving averaged 1338.66+or-15.67 days. The 1st, 2nd and 3rd calving intervals averaged 496.91+or-10.14, 453.25+or-9.16 and 456.75+or-11.43 days resp., the difference between the 1st and 2nd intercals being highly significant. Breeding efficiency was calculated as D, where n is the number of calvings and D the number of days from first to last calving.

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