Data on 1149 young rabbits of the Bouscat and Giza White breeds were analyzed to estimate genetic and phenotypic parameters for individual body weights at birth (VirB), 21 days (W71) and at weaning (WW), and preweaning daily gain (1"1)G). Data represented a total of 15 sires and 69 dams across the two breeds. Body weights and gain at weaning showed higher variation than Lhasa at birth. Effects of year of birth on weights and gain were not significant, while litter size and month of birth exerted significant effects on these traits. Individual preweaning weights and gain decreased(P