NEET BIOLOGY

Detailed explanation-1: -The oestrous cycle is the main reproductive cycle of non-primate vertebrates. For example rats, mice, horses, pigs have this form of reproductive cycle. The primates like monkey, ape and man undergo the menstrual cycle. Menstrual bleeding in non-human primates is minimal.

Detailed explanation-2: -Sexual reproduction in mammals involves cyclic changes in the ovaries, accessory glands and the reproductive hormones, during which ovum is released. In non-primate animals it is called oestrus cycle and inprimates including human beings it is called menstrual cycle.

Detailed explanation-3: -Ordinarily, during the sheep breeding season, an oestrous cycle lasts 17–19 days with a short follicular phase of 3–4 days followed by a longer luteal phase.

Detailed explanation-4: -The short length of the estrous cycle of rats makes them ideal for investigation of changes occurring during the reproductive cycle. The estrous cycle lasts four days and is characterized as: proestrus, estrus, metestrus and diestrus, which may be determined according to the cell types observed in the vaginal smear.

Detailed explanation-5: -Assertion: In non-primate mammals, cyclical changes that occur during reproduction is called oestrus cycle whereas in primates, it is called the menstrual cycle.