
1) Estruation 2) Oestrus 3) The urge
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https://www.crosswordclues.com/clue/estrus

1) Heat 2) Oestrus 3) Physiological condition 4) Physiological state 5) The period of heat or rut
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https://www.crosswordclues.com/clue/estrus

time period when the ewe is able to be bred. Also called heat.
Found on
http://premierfarmdiary.blogspot.co.uk/2012/02/glossary.html

the period in the sexual cycle of female mammals, except the higher primates, during which they are in heati.e., ready to accept a male and to mate. ... [6 related articles]
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http://www.britannica.com/eb/a-z/e/47

Female cat who is fertile & receptive to the male.
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http://www.cat-world.com.au/glossary

A term for when a female pig is in heat
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http://www.crestcapital.com/tax/pig_farming_glossary.html

The state of being in heat, in a female pig.
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http://www.crestcapital.com/tax/pig_farming_glossary.html

the time when a female animal is fertile and receptive to a male; also known as a heat period.
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http://www.encyclo.co.uk/local/20024

The recurrent, restricted period of sexual receptivity in livestock. Non-pregnant cows and heifers usually come in heat 18 to 21 days following their previous estrus.
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http://www.encyclo.co.uk/local/20076

That portion or phase of the sexual cycle of female animals characterised by willingness to permit coitus; readily detectable behavioural and other signs are exhibited by animals during this period. ... Synonym: heat. ... Origin: G. Oistros, mad desire ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973

(es´trәs) the recurrent, restricted period of sexual receptivity in female mammals other than human females, marked by intense sexual urge. See also estrous cycle. Called also estruation, estrum, and heat. adj., es´trual, es´trous., adj.
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http://www.encyclo.co.uk/local/21001

heat periods.
Found on
http://www.fairvuefarms.com/terms.htm

Heat, reproductive period when mare will accept stallion Cycle lasts
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http://www.gaitedhorses.net/Articles/HorseGlossary.html

Type: Term Pronunciation: es′trŭs Definitions: 1. That portion or phase of the sexual cycle of female animals characterized by willingness to permit coitus; readily detectable behavioral and other signs are exhibited by animals during this period. Synonyms: heat3
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http://www.medilexicon.com/medicaldictionary.php?t=30534

Being in heat. A period of varying length where a female cat produces a watery secretion from the genital tract and is sexually receptive to male cats. If mated, she will ovulate.
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http://www.pandecats.com/x/glossary.shtml

the period when the female is fertile and receptive to the male. Also called heat.
Found on
http://www.sheep101.info/201/glossary.html

Heat; a recurrent period of varying length, during which the mare produces a watery secretion from the genital tract, becomes sexually receptive to the stallion, and ovulates
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http://www.thehorse.com/Glossary.xhtml?L=E

[
n] - applies to nonhuman mammals: a state or period of heightened sexual arousal and activity
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http://www.webdictionary.co.uk/definition.php?query=estrus
oestrus noun applies to nonhuman mammals: a state or period of heightened sexual arousal and activity
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https://www.encyclo.co.uk/local/20974

The periodic state of sexual excitement in the female of most mammals, excluding humans, that immediately precedes ovulation and during which the female is most receptive to mating; heat.
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https://www.encyclo.co.uk/local/21273

the period in which a female is ready to breed.
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https://www.encyclo.co.uk/local/22350

A stage in the reproductive cycle of the female dog and cat, also known as heat.
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https://www.encyclo.co.uk/local/22445

The time of receptivity, when the bitch accepts the male for breeding.
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https://www.encyclo.co.uk/local/22445

The time of the estrous cycle during which the bitch is receptive to the male.
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https://www.encyclo.co.uk/local/22445

the period of heat or rut; the period of maximum sexual receptivity of the female. · See
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https://www.infoplease.com/dictionary/estrus
No exact match found.