The estrus cycle is regularly occurring period of sexual receptivity in most female mammals, except humans, during which ovulation occurs and copulation can take place. In some animals it happens once a year and in some twice a year. This is not the same as the menstrual cycle in humans.
On average, the menstrual cycle (oestrus) of a female goat occurs approximately every 17 to 23 days.
about three weeks
Oestrus cycle are present is most of the mammals. The females becomes sexually receptive during the oestrus phase. They express the desire for mating at this stage. In case of the humans the females are more receptive at the time of ovulation. But there are many exceptions. In case of the oestrus cycle the endometrium is reabsorbed. In case of the menstruation the endometrium is shed away to give the phenomena called as menstruation.
It can be as short as a couple of hours or as long as a few days. But it is usually around 1-2 days?
Pro-oestrus, where the vulva swells and there is clear, then bloody, discharge. The female is often nervous.
If you are talking about oestrus to do with female animals (e.g. the cow in oestrus) it means that that animal is in heat. They are ready and capable to mate.
Oestrus
it means that your cat is not healthy
Stand and watch - it doesn't usually take long. Does have no cycle that takes them in and out of oestrus as do most mammals - they can mate and become pregnant at any time.
Cheetahs breed throughout the year; they are induced ovulators. Females are polyoestrus – they have an oestrus ("heat") cycle every 12 days (this can vary from 10 to 20 days), each oestrus lasting one to three days.
Ovarid tablets should be given to a dog at the onset of pro-oestrus. It is recommended that the dog receive at least 7 days of treatment. The drug is used to prevent oestrus.
it is a period in animals where they become sexually active