The laying of eggs isn't really all that analogous to menstruation; the egg itself is a zygote, which is distinct from the unfertilized ovum .-- 32 " "'03 : 33, 3 February 2011 ( UTC)
2.
"' Tubal factor infertility "'( "'TFI "') is female infertility caused by diseases, obstructions, damage, scarring, congenital malformations or other factors which impede the descent of a fertilized or unfertilized ovum into the uterus through the Fallopian tubes and prevents a normal pregnancy and full term birth.
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