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Factor affecting age at first calving in Friesian X Sahiwal Tharparkar crossbreds



Factor affecting age at first calving in Friesian X Sahiwal Tharparkar crossbreds



Indian Veterinary Journal 69(10): 908-911



The normal breeding records of 3421 crossbreds maintained at five dairy farms were analysed to study the magnitude of genetic and non-genetic factors affecting age at first calving. Farms, genetic groups, period of first calving and season of first calving had highly significant effect on age at first calving. Among the five farms, NDRI farm showed the highest value and the lowest value was observed in Dehradun farm. Age at first calving decreased with increased Friesian level in crossbreds upto 50 per cent exotic inheritance and thereafter it increased. As the period increased, the age at first calving continuously decreased. Spring calvers had the shortest age at first calving as compared to the animals calved in other seasons. Analysis based on NDRI farm data indicated that halfbreds had the shortest age at first calving as compared to other genetic groups.

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