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The estrous cycle (from Latin oestrus 'frenzy', originally from Ancient Greek οἶστρος (oîstros) 'gadfly') is a set of recurring physiological changes induced by reproductive hormones in females of mammalian subclass Theria. [1]
If the mare was prevented from doing so, she would feel no affection for the foal and refuse to feed it, which is why it was believed that the power of love was concentrated in the hippomanes. The vulval discharge from the mare in oestrus was also referred to as Hippomanes in antiquity and was used equally for love potions and love spells. [8] [9]
The cycle is controlled by several hormones which regulate the estrous cycle, the mare's behavior, and the reproductive system of the mare. The cycle begins when the increased day length causes the pineal gland to reduce the levels of melatonin , thereby allowing the hypothalamus to secrete GnRH.
Animal Jam Classic, [1] formerly known as Animal Jam, is a massively multiplayer online game developed by WildWorks and recommended for kids up to the age of 12. It was launched in 2010, in collaboration with the National Geographic Society . [ 2 ]
Females of other species of placental mammals undergo estrous cycles, in which the endometrium is completely reabsorbed by the animal (covert menstruation) at the end of its reproductive cycle. [8] Many zoologists regard this as different from a "true" menstrual cycle.
A mare is an adult female horse or other equine. [1] In most cases, a mare is a female horse over the age of three, and a filly is a female horse three and younger. In Thoroughbred horse racing , a mare is defined as a female horse more than four years old.
Lordosis behavior (/ l ɔːr ˈ d oʊ s ɪ s / [1]), also known as mammalian lordosis (Greek lordōsis, from lordos "bent backward" [1]) or presenting, is the naturally occurring body posture for sexual receptivity to copulation present in females of most mammals including rodents, elephants, cats, and humans.
CIDRs are approved for use in both beef cattle and dairy heifers in Canada and the United States. [2] CIDRs contain 1.9g of progesterone in Canada and 1.38g in the United States. [2] The CIDR-S is licensed for use in sheep and goats in New Zealand and Australia. [1] The CIDR-G is also suitable for use in ewes, lambs and goats. [4]