Question: what is estrous cycle?

Jacquie Oliwa answered on 13 Jul 2017:

Hi there,
There are two types reproductive cycles: the oestrous (estrous) cycle and the menstrual cycle.
The Oestrous Cycle:
1. It occurs in non-primates such as cows, dogs, etc.
2. It consists of a short period of oestrous or heat (e.g., 12-24 hours in cow) followed by anoestrous or passive period.
3. Blood does into flow in this cycle.
4. The broken endometrium is reabsorbed.
5. Sex urge is increased during oestrous period (the animal is said to be in heat)
6. Female permits copulation only during oestrous period

Menstrual Cycle:
1. It occurs in primates (monkeys, apes and human beings) only.
2. This cycle consists of menstrual phase, proliferative phase and the secretory phase.
3. Blood flows in the last few days of this cycle.
4. The broken endometrium is passed out during menstruation.
5. Sex urge is not increased during menstruation, and may be present throughout the cycle
6. The female does not usually permit copulation during menstrual phase of the cycle

Best,
Jacquie