Twenty years earlier, animal researchers established that hormones could prevent ovulation in rabbits and other species.

Let's start with looking at exactly how the pill works in a woman's body to prevent ovulation.

They work the same as regular birth control pills by preventing ovulation.

Although we don't know exactly how it works, it's believed to prevent ovulation.

This is done to prevent unpredictable ovulation, which would make it necessary to cancel that in vitro attempt.

It can prevent or delay ovulation, the process by which the egg is released from the ovary.

The compounds appeared to prevent ovulation in laboratory animals.

They inhibit follicular development and prevent ovulation as a primary mechanism of action.

The hormone is gradually and slowly released from the plastic rods, thus preventing ovulation.