Estimation of expected correlated response and probable breeding value in Sahiwal herd

摘要

The expected correlated response in first calving interval is indirect when selection is applied to other economic important traits such as first service period or first dry period or first lactation length in dairy animals. This predicted correlated response in first calving interval on the basis of early expressed economic traits and probable breeding value are accurate enough for identification of cows with superior germplasm for effective genetic progress in the dairy herd. The data on 416 Sahiwal cows maintained at Government Cattle Breeding Farm, Anjora, Durg (Madhya Pradesh) covering a period of 42 years (1956-97) were analysed for various economic important traits viz.. first calving interval (FCI), first service period (FSP), first dry period (FDP) and first lactation length (FLL). The correlated response to selection was estimated for first calving interval as per Falconer, (1989), when selection is applied to first service period or first dry period or first lactation length. The heritability was estimated by half sib correlation method (Hazel and Terril, 1946) and genetic and phenotypic correlations by Hazel et al., (1943).