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The aim of this study was to analyse the influence of breeding factors, such as gestation length, age, dates and number of matings, on the female reproductive performance in farmed American mink (Neovison vison). We observed a group of 1372 females, variety Silverblue, in the period from 5 to 24 March (mating season) and from 25 April to 10 May (whelping period). We analysed the reproduction in females aged from 1 to 4 years. Apart from age, the evaluation of reproductive performance included the date of the first mating, number of matings and the length of pregnancy. We analysed the litter size at birth and at weaning, as well as the rate of barren females. The results showed that age, date of mating and the number of matings had a significant impact on the length of pregnancy and reproductive performance of the females. It was found that reproductive performance deteriorates in a longer gestation.

SELECTING THE DATE OF MATING IN FARM MINK (NEOVISON VISON) FOR OPTIMIZATION OF REPRODUCTION PERFORMANCE