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22. Distinguish between Menstrual cycle and estrous cycle.


Menstrual cycle

  1. It occurs in primates only (Monkeys, apes and human beings)

  2. It involves loss of blood.

  3. Menstrual cycle consists of menstrual phase, proliferative phase, and the secretory phase.

Oestrous cycle

  1. It occurs in non-primates such as cow, sheep, rats, deer, dogs etc…

  2. Loss of blood is not involved.

  3. It consists of a short period of oestrous or heat.

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