Question

Oestrous cycle is reported in

• A. Cows and sheep
• B. Humans and monkeys
• C. Chimpanzees and gorillas
• D. Humans and cows

Answer 1

The correct option is A Cows and sheep

• The females of placental mammals exhibit cyclical changes in the activities of ovaries and accessory ducts as well as hormones during the reproductive phase.
• In non-primate mammals like cows, sheep, deer, dog, tiger, etc., such cyclical changes during reproduction are called the oestrus cycle whereas in primates (monkey, apes, and humans) such cyclical changes are called the menstrual cycle.

So, the correct answer is 'Option A- Cows and sheep'.