Infantile stimulation and exploratory behavior in the rat.
D000818:Animals; D000831:Animals, Newborn / Q000254:growth & development*; D004644:Emotions; D004777:Environment; D005106:Exploratory Behavior; D005260:Female; D006234:Handling, Psychological; D008297:Male; D051381:Rats; D012737:Sex Factors; D014886:Weaning