The estrous cycle is the cycle of a non-pregnant female mammal that goes through a luteal phase and a follicular phase. Estrus is the period in which an animal will stand to be bred, and is part of the follicular phase of the estrous cycle.
An easy way to remember it is that estrous is an adjective and estrus is a noun. Thus, estrous refers to the entire cycle, whereas estrus just refers to the phase in which the animal can get pregnant.
Usage:
The female chimpanzee can get pregnant because she is in estrus.
The female chimpanzee can get pregnant in this phase of her estrous cycle.
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The length of estrous for cattle is approximately 21 days. The estrus period last about 18 hours.
A cow's estrous cycle typically lasts about 21 days. This is the period of time between one heat (or estrus) and the next.
Estrous refers to the recurring periods of sexual receptivity and fertility in female mammals, commonly known as the estrous cycle. During estrus, females are ready to mate and can conceive. This cycle is influenced by hormonal changes and varies in length among different species.
"four months, four days." Ok you are off just a little. First of all, you are thinking of the gestation period which is actually 3 months 3 weeks 3 days. the Estrous Cycle is 21 days. length of estrus is anywhere from 12 hours to up to 60 hours. The gestation period is the length in which the animal is pregnant. The estrous cycle is the time between 2 estruses. And an Estrus is the time in which they are fertile or in heat.
Estrus in a cow or heifer only lasts for ~24 hours.