This study was conducted to estimate the effect of breed. year of kindling, season of kindling and month of age at kindling on the reproductivity in does. The data used in this study were obtained from total 4,024 litters of New zealand white (2,302 litters) and Californian (1,722 litters) raised at the Animal Breeding Institute from 1978 to 1986. The results obtained are summarized as follows: l. Significant (P$lt;0.05) differences were detected for born number, litter size at 21-day and at weaning among the breeds, kindling seasons and years, respectively. Except for growth rate from birth to 21 days of age, linear regression for month of age at kindling affected litter size and growth rate significantly (P$lt;0.01). 2. Breeds affected kitling weight at 21-day and at weaning significantly (P$lt;0.01). Years and seasons affected litter weight at 21-day and at weaning significantly (P$lt;0.01). 3. Breeds affected gestation length significantly (P$lt;0.01). The gestation length least-square means were 31.2±0. 18 and 31.8±0.27 in New zealand, Californian breed, respectively. Breed and season affected within-litter uniformity significantly (P$lt;0.01). Least-square means of within-litter uniformity over all litters studied was 12.0+1.12％.