title: A survey of eggs in the oviducts of mares.
abstract: A total of 424 eggs was recovered from flushings of 176 pairs of oviducts. Of these eggs, 324 were in a state of advanced degeneration (Type 4) and ten appeared to have been recently ovulated (Type 1). The number of eggs/oviduct varied from 0 to 13, most being up to 3 eggs, but fifty oviducts contained no eggs. It is widely believed that unfertilized ova are selectively retained in the oviducts but an alternative explanation for their presence is put forward.
mesh_terms: D000818:Animals; D004971:Estrus; D005187:Fallopian Tubes; D005260:Female; D005306:Fertilization; D006736:Horses; D010060:Ovulation; D010063:Ovum; D011247:Pregnancy; D012621:Seasons