Why do animals go into heat (mammals) about every 3 months instead of every month, like a humam?(Menstruation)

Question

Females that is?

Answer 1

Most mammals actually come into estrus once a year. Domestic animals come into heat (as you put it) about every three months as an artifact of domestication. We wanted to be able to breed our animals more often so we selected for and provided for breeding more often. Some animals are able to reproduce all year round, but what that really depends on is resource availability. If the resources, namely food, are available on a steady basis, the animal will be more likely to reproduce more often (ie, rodents. If there is a lot of food at any given time like in a grain elevator, the mice will breed year round, but in the wild, like a meadow, their reproduction is restricted to warm spring and summer months. They can produce several litters during that time, but they ususally wont in winter). But even with that, most only are able to reproduce once a year as a consequence of environmental factors needed for reproduction such as mate availability, food, space, environmental temperature, and all that. Other animals can be induced into estrus by coming across another of its species or by loosing its offspring. Humans are the extreme at being able to concieve year round.

Answer 2

I believe mammals have litters of their kind unlike humans who have twins or triplets or science helped multiple babies.

Answer 3

mammals don't have the same dating issues...