The oocyteOvarian cell, the precursor of the ovum. is expelled from the ovaryFemale reproductive glands, located symmetrically on either side of the uterus, which produce the female gametes. 10 to 12 hours after oestrusAlso known as heat, is the physiological and behavioral phenomena which precedes and accompanies ovulation in female mammals. is finished.
2. Migration of the oocyte
It arrives by the infundibulum into the ampulla of the oviductDuct through which female gametes are expelled from the ovary in animals. within 6 hours of ovulationExpulsion of an ovum from the ovary in female animals..
The ovum remains fertilisable for 8 to 12 hours after ovulationExpulsion of an ovum from the ovary in female animals. and the spermatozoa stay fertile for 24 to 48 hours in the female genital canals. The ovum is surrounded by spermatozoa. Only one of them succeeds in penetrating and fertilising it.
4. Cell division
The egg divides and migrates towards the isthmus of the oviductDuct through which female gametes are expelled from the ovary in animals.. After 4 days, at the 8th to 16th cell stage, it arrives in the horn of the uterusGenital organ of female mammals, located between the fallopian tubes and the vagina, which hosts the fertilised egg until its full development takes place and it is expelled at the end of gestation..