title: A comparison of the breeding success of two strains of laboratory rats in relation to age at mating.
mesh_terms: D000204:Activity Cycles; D000367:Age Factors; D000818:Animals; D000830:Animals, Laboratory; D001947:Breeding; D004780:Environment, Controlled; D005260:Female; D008027:Light; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains / Q000502:physiology*; D012621:Seasons