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• W2187447312 abstract "The present study was conducted on 782 crossbred cows sired by 35 bulls, maintained over the period from 1985 to 2009. The data was analyzed for estimation of averages, effect of period and season of calving, heritability and genetic and phenotypic correlations. The economic traits studied were age at first calving (AFC; days), first calving interval (FCI; days), first service period (FSP; days) and first dry period (FDP; days).The averages for AFC, FCI, FSP and FDP were 1213.54±8.85, 420.08±3.41, 131.26±3.15 and 105.00±2.73 days, respectively. Effect of period of calving was significant (P<0.05) for all the economic traits. Effect of season of calving was significant for all the economic traits (FCI, FDP and FSP) except AFC. It may be inferred that maximizing the number of calvings between October and March may be exploited to utilize the genetic potential of crossbred cattle for all the traits. High estimates of heritability were obtained for all the traits except FCI. Genetic correlations of AFC with all other traits were very low. It may be inferred from the estimates of heritability, genetic and phenotypic correlations that age at first calving with other production traits may be used in simultaneous selection for overall improvement in traits of economic importance. India has witnessed a white revolution in eighties and nineties of the last century, which is largely due to manifold increase in milk production attributed largely to crossbred cows. Cross breeding of indigenous cows (Bos indicus) with exotic (Bos taurus) bulls was started to enhance genetic potential of milk production. The basic theme was to confluence the milk yield potential of exotic breeds and stress sustainability and disease resistance capabilities of indigenous breeds within the crossbred progenies, which would be desirable to maintain them under tropical climatic conditions. For establishing any selection or breeding programme the knowledge of genetic properties of traits of economic importance is the pre-requisite. It is therefore, essential to understand the genetic and phenotypic association among these traits and the extent to which the genetic variation exist in them. Genetic improvement of a population under selection is highly dependent on heritability of each trait. Estimation of genetic parameters is essential in animal breeding and genetics because these are location and time-specific and it may not be appropriate to apply estimates from other populations. Additionally, differences in management, feeding conditions and statistical methodology as well, may offer different results.Therefore, the present investigation was undertaken to estimate genetic and phenotypic parameters of different reproduction traits and to evaluate the effect of genetic and non-genetic factors on these traits." @default.
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• W2187447312 date "2013-01-01" @default.
• W2187447312 modified "2023-09-24" @default.
• W2187447312 title "Genetic studies on reproduction traits in crossbred cattle." @default.
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