Practicing Success
Which of the following animals exhibit the estrous cycle? |
Cow and sheep Gorillas and monkeys Humans and chimpanzees None of these |
Cow and sheep |
The correct answer is Option (1) -Cow and sheep In non-primate mammals like cows, sheep, rats, deers, dogs, tiger, etc., such cyclical changes during reproduction are called oestrus cycle where as in primates (monkeys, apes, and humans) it is called menstrual cycle. Many mammals, especially those living in natural, wild conditions exhibit such cycles only during favourable seasons in their reproductive phase and are therefore called seasonal breeders. Many other mammals are reproductively active throughout their reproductive phase and hence are called continuous breeders. |