1) Anestrum 2) Anoestrum 3) Anoestrus 4) Diestrum 5) Diestrus 1) Anestrum 2) Anoestrum 3) Anoestrus 4) Physiological condition 5) Physiological state 
(from the article `dog`) ...When all signs of discharge and swelling are absent, the heat is complete. The diestrus stage lasts 60 to 90 days (if no pregnancy has occurred) ... If fertilization and implantation do not occur, a phase termed metestrus ensues, in which the reproductive tract assumes its normal condition. ... [2 related ...
The period between estrus in the female. 
Period of sexual inactivity between estrus periods in animals. ... (12 Dec 1998) ... 
When a mare is not having or showing heat or estrus
Type: Term Pronunciation: an-es′trŭs Definitions: 1. The period of sexual quiescence between the estrus cycles of mammals; may be: 1) a prolonged period in monestrous animals (dogs) or seasonally polyestrous animals (sheep), or 2) a prolonged period of failure of estrus in mature nonpregnant, polyestrous animals.
The condition of not being in season for a female cat.
The time in which sheep are sexually inactive, usually during spring and summer months. Animal Damage Control (ADC)
The sexually inactive period between two estrus cycles.
[n] - applies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrus
anestrum noun applies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrus
An interval of sexual inactivity between two periods of estrus in female mammals that breed cyclically.
(of a female mammal) the interval of sexual inactivity between two periods of heat or rut.