The aim of this study was to determine the variance components for birth andweaning weights in Holstein calves. In this purpose, a total of 675 calf birthweight and 295 weaning weight records of Holstein calves raised at KuzucuDairy Cattle Farm in Ereğli, Konya Province were used for estimation of phenotypic and genetic parameters for calf birth weight and weaning weight.Phenotypic and genetic parameters were estimated by WOMBAT programusing a Single Trait Animal Model (STAM). The model constitutes of additivedirect effect, maternal genetic effect (only for Model II) and errors as randomeffects, birth type, sex of calf, season of birth, year of birth and age of dam asfixed effects. Least square mean of calf birth weight was determined as 34.992± 0.572 kg. The direct heritability (ha2) of calf birth weight was calculated as0.180±0.109 in Model I and the direct heritability (ha2) and maternal heritability (hm2) of calf birth weight were calculated as 0.154±0.096 and 0.141±0.106in Model II, respectively. The effect of calving season, birth type, sex and ageof dam on birth weight of calf were significant (P<0.01), but not calving year(P>0.05). As for calf weaning weight, least square mean was determined as74.250 ± 1.775 kg. For calf weaning weight, the direct heritability (ha2) inModel I was calculated as 0.104± 0.126 and the direct heritability (ha2) andmaternal heritability (hm2) in Model II were calculated as 0.104± 0.127 and0.00002±0.341, respectively. The effect of calving year (P<0.05), birth type(P<0.05), sex (P<0.01) and birth weight (P<0.01) on weaning weight of calfwere significant, except for calving season and age of dam (P>0.05) Furtermore, estimated breeding values (EBVs) estimated by BLUP (Best LinearUnbiased Prediction) for calves, sires and dams were found to be in generalwith the range of -3.245 to 2.577, -2.607 to 2.631 and -1.714 to 1.747 for birthweight and -2.969 to 2.274, -2.650 to 2.376 and -1.456 to 1.301 for weaningweight, respectively.