Synonyms for Estrus:

n.

courtship, couple, breeding ground, breed, fecund, fertile, asexual reproduction, season, breeding, breeder. estrus (noun)
oestrus, rut, heat.
state (noun)
oestrus, rut, heat.

Other synonyms:

breeding, breeder, fecund, asexual reproduction. couple, fertile, breeding ground. courtship, season. breed. Other relevant words:
fecund, courtship, season, couple.