title: Aggression in the lactating rat: effects of intruder age and test arena.
mesh_terms: D000367:Age Factors; D000374:Aggression; D000818:Animals; D000831:Animals, Newborn; D001522:Behavior, Animal; D004777:Environment; D005260:Female; D006801:Humans; D007774:Lactation; D008297:Male; D008425:Maternal Behavior; D009068:Movement; D009425:Nesting Behavior; D011247:Pregnancy; D051381:Rats; D013997:Time Factors