In studies took into account 50 mothers and 229 puppies of silver fox as well as 45 mothers and 326 puppies of polar fox. The animals were allocated to 5 group depending on method of separation puppies from their mothers. Puppies from 1-3 groups were in pernament contact with mothers by sight, smell and hearing. The puppies from 1 and 4 groups were in maternal cages, the puppies from others groups...
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