Genetic Evaluation of Crossbred Cattle for Reproduction Traits
Journal Title: International Journal of Agricultural Science and Research (IJASR) - Year 2017, Vol 7, Issue 6
Abstract
The data on 333 crossbred cows maintained in the Department of Animal Genetics and Breeding, Lala Lajpat Rai University of Veterinary and Animal Sciences, Hisar, Haryana over a period of 24 years from 1991 to 2014 were analyzed for studying the effect of genetic factor i.e. sire group and non genetic factors i.e. period of calving, season of calving and milk yield group and to estimate genetic and phenotypic parameters for reproduction traits. The traits studied were age at first calving (AFC), first service period (FSP), first calving interval (FCI), number of services per first conception (NS/FCON), waiting period (WP) and daughter pregnancy rate (DPR42, DPR63). The least squares mean for AFC, FSP, FCI, NS/FCON, WP, DPR42 and DPR63 were observed as 1242.75±16.46 days, 148.46±6.99 days, 429.08±7.08 days, 1.90±0.12, 100.85±4.20 days, 0.27±0.02 and 0.35±0.04, respectively. The period of calving had significant effect on AFC, while season of calving had significant effect on FSP and FCI. The milk yield group had significant effect on all traits. Heritability estimates of these traits were low to moderate. Genetic and phenotypic correlations among FSP, FCI, WP and NS/FCON were found to be moderate to high positive. DPR showed moderate and negative genetic correlation with FSP, FCI, WP and NS/FCON whereas; corresponding phenotypic correlations with these traits were significant negative.
Authors and Affiliations
Sunil Kumar
Keywords
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