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on heat phrase UK
An animal that is in heat is in a state of sexual excitement and ready to breed.
in rut phrase
(of particular male animals) sexually excited:
The bull elephant seal only puts on this display when in rut.
/ ˈrʌt̬.ɪŋ / adjective
relating to the period of the year during which particular male animals are sexually active:
the rutting season 发情交配季节

(Translation of 发情 from the Cambridge Chinese (Simplified)-English Dictionary © Cambridge University Press)