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estrus

estrus

1 9.9
A regular time when female mammals are ready to mate and able to become pregnant
  • noun
  • /ˈɛstrəs/
  • Specialized
translation icon : celo
  • Early that summer, an adult female, Krom, had come into estrus, and Yeroen had made overtures.
  • females in estrus
  • estrus detection
  • insemination and estrus

They have the kind of swellings that they do when they're in estrus, but but that we just don't have that.

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Examples

  • Fieldworkers have observed that common chimpanzee mothers whose infants were killed quickly resumed estrus and remated.

    Academic text (1990)
  • Subsequently, they entered full estrus and began to be mounted by the buck whose territory they were in.

    Academic text (1991)
  • - She'll be in estrus a short time.

  • Adult females may also mate with multiple males within a single estrus period.

    Academic text (1998)
  • At any one time, some females are in estrus, and so males can almost always readily find mates.

    Academic text (1990)
  • In ungulates, females in estrus are often harassed by young males.

    Academic text (1991)
  • More than forty years ago, I hypothesized that the calling of the bulls triggered and synchronized estrus.

    Academic text (2006)
  • A female dog usually goes into estrus twice a year, making her receptive to mating.

  • During estrus, many female mammals display specific behaviors to attract males.

  • Farmers need to be aware of when their cows are in estrus to optimize breeding opportunities.

Synonyms

heat
vsestrus
  • Specialized
49 7.9

A time when a female animal is able to mate

is recurring across many species rather than limited to some mammals
in oestrum
vsestrus
  • NSFW
9.9

A female animal ready to mate and able to have babies

refers to a recurring fertile period rather than the immediate receptive state

Antonyms

anestrus
  • Specialized
9.9

A time when a female mammal is not sexually active and not ready to mate

Surface Forms

estrus singular
estruses plural

Etymology

Estrus comes from the old Greek word oistros, which meant a 'frenzy' or 'strong urge'. So estrus names the time when female animals feel a strong sexual urge to mate, and it is the same root used in oestrogen (the hormone).