estrus

synonyms: heat, oestrus
https://doi.org/10.1351/goldbook.10685

Recurrent period of sexual receptivity and arousal in the female of most mammals except the higher primates, during which conception is possible.

Source:
PAC, 2016, 88, 713. (Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)) on page 751 [Terms] [Paper]