Question
Differentiate between: Oestrus and Menstrual cycles.

Answer

Oestrus and Menstrual cycles:
S. No
Oestrus cycle
Menstrual cycle
(i)
It involves no uterine bleeding.
It ends with uterine bleeding.
(ii)
It continues until death.
It continues till menopause.
(iii)
Occurs in non-primates. eg. sheeps, cows.
Occurs in apes and humans.

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