A good breeding operation should have a breed season of 60 to 80 days. Some operations will have a breeding season of 100 to 130 days, whereas still others have a year-round breeding and calving season.
Long, showy feathers, acquired during the breeding season
a bandicoots don't have a breeding season they breed all year long.
Frogs stop croaking when breeding season is over.
Cardinals mate throughout the entire year. They stay together for the rest of their life.
Koalas stay with their mother for about a year, until the following year's breeding season.
No. Merlin falcons will usually stick to one partner for the duration of a breeding season, but may switch come next season.
Breeding season for cows and heifers should be from 45 to 90 days long. Sixty days is considered optimum.
Breeding stallions can live as long as any other horse...
Horses are 'long day' or 'long light' breeders. They will come into season and begin breeding when the daylight hours begin to extend. Which is most typically spring and summer.
Young platypuses are old enough to leave their mother at about four months old, but they tend to stay with her until the next year's breeding season.
There are three species of mammals that lay eggs: the Platypus and two species of echidna, the long-beaked echidna of New Guinea and the short-beaked echidna of Australia. The platypus tends to lay 1 to 3 eggs each breeding season, whereas the echidna lays a single egg into a rudimentary pouch that it develops during the breeding season.
In the first 21 days of what? After they've given birth? Or during the start of breeding season? If it's the latter, the reason is that it's a sign of good fertility in the cow herd if the majority of females are able to cycle and catch (or be successfully bred) within the first 21 to 45 days of the start of breeding season. A shorter breeding season means a shorter calving season, and with a high fertility rate in your herd, that's less of a head-ache (if you are using the proper bulls on your cows!) during calving season because a) it's not going to be dragged out for a third of the year, and b) less labour if more cows can drop calves on their own instead of requiring assistance. A short breeding season also is a great indicator of which cows need to go and which can stay, based on how long it takes them to get back into estrus and get settled by the bull.