There are different stages:
Proestrus: female attracts males, bloody discharge. Lasts about 9 days though the female won't breed.
Estrus: Female will accept male and is fertile. Lasts about 9 days.
Diestrus: Lasts between 60-90 days. This is when the reproductive tract is under the control of the hormone progesterone. Sometimes a "false pregnancy" can occur.
Anestrus: no sexual activity takes place. Lasts 3-4 months. |