The influence of different breeds of exotic sires on the gestation length of Hariana cows
Tomar, S.S.; Arora, K.L.
Indian Veterinary Journal 49(6): 572-577
ISSN/ISBN: 0019-6479 Accession: 000234707
From a study of 446 pregnancies terminating in single births of normal calves, it was found that the gestation period of Haryana cows carrying purebred calves (290.5 plus or minus 0.4 days) was significantly shortened by 3.4, 8.4 and 9.4 days when the cows were bred to Swiss Brown, Holstein-Friesian and Danish Red bulls resp. Calves from Swiss Brown matings were carried significantly longer than calves from the other 2 types of mating. In the case of Haryana and Holstein-FriesianXHaryana calves, males were carried significantly longer than females (by 3.7 and 3.2 days resp.).