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Ewes generally reach sexual maturity at six to eight months of age, and rams generally between four and six (though ram lambs have occasionally been known to impregnate their mothers at two months). [1] Sheep are seasonally polyoestrus animals. [3] Ewes enter into estrus cycles about every 17 days, which last for approximately 30 hours. [1]
This is a collection of lists of mammal gestation period estimated by experts in their fields. The mammals included are only viviparous (marsupials and placentals) as some mammals, which are monotremes (including platypuses and echidnas) lay their eggs. A marsupial has a short gestation period, typically shorter than placental.
European mouflon have a body length of up to 120 cm, a shoulder height of 90 cm, a weight of 25 to 40 kg for ewes, 35 to 55 kg for the ram. The European mouflon has a smooth hairy coat, the rams are fox red-brown in the summer, usually with a whitish saddle patch, the ewes are brownish. Both sexes are darker in winter.
Short-day breeders, such as sheep, goats, deer and elk are sexually active in fall or winter. Long-day breeders, such as horses, hamsters and ferrets are sexually active in spring and summer. Species that go into heat twice per year are diestrous. Canines are diestrous. [citation needed]
Seasonal breeders are animal species that successfully mate only during certain times of the year. These times of year allow for the optimization of survival of young due to factors such as ambient temperature, food and water availability, and changes in the predation behaviors of other species. [1]
Male impalas fighting during the rut or breeding season. The rut (from the Latin rugire, meaning "to roar") is the mating season of certain mammals, which includes ruminants such as deer, sheep, camels, goats, pronghorns, bison, giraffes and antelopes, and extends to others such as skunks and elephants.
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Mammals during pregnancy can have one or more gestations at the same time, for example in a multiple birth. [2] The time interval of a gestation is called the gestation period. In obstetrics, gestational age refers to the time since the onset of the last menses, which on average is fertilization age plus two weeks. [3]