Genetic Parameters of Postnatal Mortality in Danish Holstein Calves

摘要: The objective of this study was to estimate genetic parameters postnatal mortality (PM) in dairy cattle. Data originated from 841,921 Danish Holstein calves. Four binary traits were considered: D1-14, D15-60, D61-180, and D1-180 with numbers indicating the period risk days after birth. unadjusted frequency 0.027, 0.018, 0.020, 0.066, respectively. A linear sire-model fitted data, average information-REML used (co)variance components. Estimates direct heritabilities for four ranged 0.001 0.008 but all significant. D61-180 had highest heritabilities. Maternal very low, ranging 0.0002 0.0015 significant D1-14 only. correlation between D15-60 0.73, 0.54, 0.34, It indicates that different genes are responsible early PM (D1-14) late (D61-180). When treated as a trait females, males not transferred, transferred males, heritability 0.004, 0.008, 0.034, respectively, correlations these three high. If transfers calves getting more common, importance including breeding program will increase, variation considerably higher than transferred.