Pantnagar Journal of Research

Abstract

The standard data available on 166 Sahiwal cattle, distributed over a period of 30 years from 1987 to 2016, and on crossbred cattle distributed over a period of 40 years from 1977 to 2016,were utilized to know the inheritance pattern of the traits viz. Age at first calving(AFC),First lactation milk yield (FL305DMY),First lactation length (FLL) and First lactation peak yield (FLPY).The heritability estimates for AFC,FL305DMY,FLL and FLPY were observed as 0.452±0.152, 0.378±0.128, 0.277±0.101 and 0.447±0.146,respectively in case of Sahiwal cattle. The corresponding values in case of crossbreds were estimated as 0.209±0.061, 0.346±0.082, 0.225±0.063 and 0.262±0.069.The AFC trait was positively correlated with the FLL and FLPY traits at genetic level (rg) and negatively correlated with FL305DMY trait in Sahiwal cattle. The phenotypic correlation (rp) of AFC with FL305DMY, FLL and FLPY were positive in magnitude in case of Sahiwal and crossbred cattle. The rg and rpvalues for FL305DMY trait with FLL and FLPY were positively correlated in Sahiwal and crossbred cattle. The FLL trait was found to be positively correlated at genetic and phenotypic levels with FLPY traits in both the Sahiwal and crossbred cattle.