1) Estrous 2) Monoestrous 
(from the article `estrus`) ...in preparation for holding the fertilized ova. As the proliferation of uterine tissue reaches its peak, receptivity is highest—this is the estrous ... ...of the reproductive tract. On the other hand, anestrus may be followed by a brief quiescent period (diestrus) and another preparatory proestrus ... ...
Having but one estrous cycle in a mating season. ... (05 Mar 2000) ... 
Type: Term Pronunciation: mon-es′trŭs Definitions: 1. Having but one estrous cycle in a mating season.
[adj] - having one estrous cycle per year
monoestrous adjective having one estrous cycle per year
of or pertaining to a mammal that has one estrus period per breeding season, as the dog.