The aim of present study was to find the dependence between chinchilla farm size and achieved reproduction indices. Results were collected from three groups of farms: M – small (up to 50 females), S – medium (50-100 females in herd), D – large (over 150 females). In total, 2743 litters originating from 630 chinchilla females of standard race and performed in 1999-2003 on 8 farms of southern Poland were analyzed. Following items were examined: litter population at the birth and weaning, fall number, efficiency of progeny rearing, mortality per a litter, and pregnancy interval. Significant differences were recorded referring to the number of reared litter; the largest number of animals reared per a litter (1.77 kids per litter) occurred on medium farms, the smallest (1.63 kids per litter) on large farms. The lowest number of young falls during rearing was observed on small and medium farms (0.23 and 0.19 kids per litter, respectively), as well as the best rearing efficiency (88.2 and 89.8, respectively). Farm size did not affect the distribution of pregnancy intervals.

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