Insemination

 

Behaviour in Post-oestrus

Post-oestrus is not a clearly defined phase. It runs from when the animal no longer allows itself to be mounted until the visible external and internal symptoms of heat begin to subside. In post-oestrus, an animal which was in heat becomes calm again and no longer stands still when other cows attempt to mount it. The swelling of the vulva subsides.

Some blood may be observed coming from the vagina. This is called metoestral bleeding. The blood comes from the uterus, which had an increased blood supply during oestrus. Because ovulation takes place around 12 hours after the main phase of oestrus (positive standing reflex, mounting at the head, clear stretchy vaginal mucus), late in the main phase of oestrus and early in post-oestrus is the ideal time to inseminate. The egg is capable of being fertilised for around 12 to 20 hours.