Litters born at approximate times, of a similar average mass of kits, was - after weaning and of a differentiated quantity /seven classes of litter numbers/ - allotted to four equally numbered groups /52 kits from seven whole litters/ with an equal number of males /23 animals/ and females /29/ in each group. The authors employed various methods in separating six-week old kits from their mothers. The method of weaning, the number of litters, the sex of kits and the separating term influenced the body weight on the 30th day after weaning at the age of 16 weeks and the size and body mass during the licence of polar foxes. Foxes disengaged during weaning and deprived of any contact with their mothers were most susceptible to stresses, while this effect was the least in kits left - after being separated from their mothers - in the cage of dam and maintaining during one month a complete visual auditory and olfactory contact with their mothers kept in an adjoining cage.
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