Establishment by selective inbreeding of the IVCS strain and related sister strains of the mouse, demonstrating regularly repeated 4-day estrous cycles.
D000818:Animals; D001835:Body Weight; D004971:Estrus; D005260:Female; D006799:Housing, Animal; D007178:Inbreeding; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains / Q000502:physiology*; D010375:Pedigree; D011247:Pregnancy; D013997:Time Factors