Resorption in guinea pigs as estimated by counting corpora lutea: the problem of twinning.
D000818:Animals; D003338:Corpus Luteum / Q000032:analysis*; D010064:Embryo Implantation; D004622:Embryo, Mammalian / Q000032:analysis; D005260:Female; D005306:Fertilization; D005865:Gestational Age; D006168:Guinea Pigs; D010053:Ovary / Q000032:analysis; D011247:Pregnancy; D013997:Time Factors; D014427:Twins