NEET BIOLOGY

Detailed explanation-1: -Estrous cycle, or oestrous cycle, is the reproductive phase when the female is highly receptive and it is the indication of the onset of the breeding cycle. Animals that have oestrous cycles reabsorb the endometrium (inner membrane of the mammalian uterus) if conception does not occur during that cycle.

Detailed explanation-2: -Estrus is the period when high amount of estrogen is presents in the blood. The estrogen produces the behavioral signs of estrus, such as the mounting of other cows, the willingness to stand while mounted by other cow, and general increase of activity. Estrus is followed by a 3 to 4 day period referred to as metestrus.

Detailed explanation-3: -The estrous cycle has four phases, namely proestrus, estrus, metestrus and diestrus and lasts for 4 to 5 days [4] (Table

Detailed explanation-4: -Estrus or “heat” is a period during the reproductive cycle when female animals become sexually receptive, signaling they are ready for mating. In most cases, this can also be referred to as “standing heat” because the female will stand to be mated by the male (Figure 1).

Detailed explanation-5: -Estrous cycles are named for the cyclic appearance of behavioral sexual activity (estrus) that occurs in all mammals except for higher primates. Menstrual cycles, which occur only in primates, are named for the regular appearance of menses due to the shedding of the endometrial lining of the uterus.