MICE REARED WITH RATS: MODIFICATION OF  BEHAVIOR BY EARLY EXPERIENCE WITH ANOTHER SPECIES.
Mice in group 1 (controls) spent all their lives with other mice. Mice in group 2 had experience only with male and female rats after weaning; group 3 mice had no experience with peers-each litter was reduced to one pup, which was reared in isolation after weaning; group 4 mice were fostered to a lactating rat mother at approximately 3 days of age and thereafter lived only with rats. In adulthood group 4 mice were the least active and group 3 the most; mice in groups 2 and 4 preferred to spend time in a chamber adjacent to a rat, those from groups 1 and 3 in a chamber containing another mouse; when mice were paired off within experimental groups and given the opportunity to fight each other, the percentage of pairs in which 4 were, respectively, 44,27,100, and 0.
D000374:Aggression; D000818:Animals; D000831:Animals, Newborn; D001519:Behavior; D005260:Female; D006801:Humans; D007774:Lactation; D008297:Male; D051379:Mice; D009035:Mothers; D051381:Rats; D012106:Research; D014886:Weaning
ANIMALS, NEWBORN; BEHAVIOR; EXPERIMENTAL LAB STUDY; MICE; RATS