Question

A female dog is
(A) Monoestrous
(B) Diestrous
(C) Both A and B
(D) None of the above

Answer 1

Hint: Estrous cycle comprises the recurring physiologic changes that are induced by reproductive hormones in females of mammals. Monoestrous means having one estrous cycle per year. Diestrous means having two estrous cycles per year. Polyestrous means having many estrous cycles per year.

Complete Answer:
Estrous cycle, or estrous cycle, is that the reproductive process is found in most mammalian placental females, whereby there are recurring intervals when the feminine is fertile and sexually willing (estrus) hesitated by periods during which the feminine isn't fertile and not sexually receptive (anestrus).
There are several differences among animals in terms of their estrous cycles.

Monoestrous: Some may experience estrous just one time a year during a particulate diestrus (monoestrous example Virginia deer, foxes), while others may experience a succession of cycles (polyestrous) during a particular time of the year if they are doing not become pregnant (horses, sheep), et al. may undergo cycles throughout the entire year (mice, cows, pigs).

Diestrous: A female dog is an example of diestrous.
The diestrus phase is characterized by the activity of the corpus luteum, which produces progesterone. The signs of estrogen stimulation subside and therefore the endocrine gland starts to make. The uterine lining begins to appear. In the absence of pregnancy, the diestrus phase (also termed pseudo-pregnancy) terminates with the regression of the endocrine gland. The lining within the uterus isn't shed but is reorganized for the subsequent cycle.

Thus, the correct answer is Option B- diesterous.

Note: Animals that have estrous cycles reabsorb the endometrium (inner membrane of the mammalian uterus) if fertilization does not occur during that cycle. The estrous cycle is varied with the cycle during which the endometrium is removed through menstruation when pregnancy doesn't occur and during which the feminine could also be sexually willing at any time during the cycle.