title: Operant investigation of mating preference in female rats.
mesh_terms: D000818:Animals; D003216:Conditioning, Operant; D004971:Estrus; D005260:Female; D006799:Housing, Animal; D008297:Male; D011247:Pregnancy; D051381:Rats; D012737:Sex Factors; D012726:Sexual Behavior, Animal; D013997:Time Factors