発はつ情じょう期き

noun

mating season; estrus; rut

Refers to the period when animals are sexually receptive and mate. Used for mammals in general; 発情期 can apply to both wild and domestic animals.

• 猫ねこの発はつ情じょう期きは春はると秋あきに多おおい。

  Cats' mating season is often in spring and autumn.

• 鹿しかの発はつ情じょう期きにはオス同どう士しの争あらそいが見みられる。

  During the deer's rut, fights between males can be observed.