A two year study was performed at the experimental farm located in SE Poland. We have conducted an experiment on females from the scanbrown morph. During the first year of our study we created two groups: K i D .The minks were fed a well balanced high energy feed with a witamin-mineral premix GuyoFox additive. Till November it was supplemented with an antioxidant Rendox and preservative (sodium pyrosulphite) in group D. During the second year, after first insemination in particular day they were successively randomly selected into two experimental groups, 30 ind. each. We fed animals with lower energy feed htan in the previous year. Group K1 was the control group. Animals from the ( D1 ), experimental group were fed with a smaller rate of feed during period from 15.IV. to 10.V. Several breed parameters like the length of pregnancy period, percentage of fertilised and sterile females, mean number of puppies in single breed, percentage loos of puppies to 7^th day, between 7^th and 14^th day, and number of puppies weaned from statistical dam, mass of breed and puppies in 2^nd,7^th,14^th and 21^st day were analysed. Limited feeding of minks in prebreeding period contributed positively on behaviour and breeding parameters of females from grup D1. Maintaining a high sanitary standard of feeding contributed to lower the looses of youngs.

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