The fertilization of an egg and subsequent growth of one tiny cell into the perfect foal is a very complex process. Understanding the various stages of development can help you understand how pregnancies can be challenged and what’s going on in the event of a problem.

Pregnancy in the mare can be divided into four main events–fertilization, early embryo development, placentation (formation of the placenta), and organ growth.

Fertilization

The ovum, or egg, released by the follicle is directed through the infundibulum, then down the fallopian tube (also called the oviduct) where it waits in the ampulla region for the arrival of the sperm. It is unable to pass through the uterotubal junction until it has been fertilized

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