Records of 305-day Fleckvieh lactation for yields of milk (MY), fat (FY), protein (PY), fat-plus-protein (FPY) and carrier (CY) were examined and estimates of genetic, phenotypic and environmental variations and covariations were obtained for the first three lactations as well as for combined all lactations. A total of 26874 records representing 10486 cows sired by 650 bulls extracted from 50788 records were used. Means and standard deviations of milk traits increased with advancing of parity. Greater increase in yield traits was found from first to second lactation than from second to third lactation. Coefficients of variation (CV) for milk traits ranged from 12.9% to 17.2% in the first lactation, from 11.4% to 17.8% in the second lactation and from 14.3% to 15.5% in the third lactation. Estimates of CV% for FY was higher than that for PY. The sire of the cow affected significantly (P |
