Factors affecting service period and its genetic phenotypic relationships with other reproductive traits in Gir cows
2003
Barwe, V.K. | Tomar, S.S. | Qureshi, M.L. (College of Veterinary Science and Animal Husbandry, Mhow (India). Department of Animal Breedingt and Genetics)
Records of service period of Gir cows maintained at Kasturba Gandhi National Memorial dairy Farm, Kasturbagram, Indore were analyzed. The least squares mean of service period was 161.44+/-4.85 days with coefficient of variation as 62.69%. The trait was highly significantly influenced by period of calving and parity. Regression of service period on age at first calving was also significant. The effects of season of calving and sex of calf born were nonsignificant. The heritability estimate of serive period was low (0.024+/-0.011) indicating that the trait can be improved by ameliorating the managerial and other environmental conditions. The phenotypic and genetic correlation of serivce period age at first calving and calving interval were highly significant and positive suggesting that selection of cows for low age at first calving would affect simultaneous improvement in overall reproductive efficiency of herd. The phenotypic and genetic correlations of service period with gestation period were nonsignificant.
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
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تم تزويد هذا السجل من قبل Indian Council of Agricultural Research