noun
estrous cycle
Biological term for the recurring reproductive cycle in female mammals, including phases such as proestrus, estrus, metestrus, and diestrus.
マウスの発情周期は約4日です。
The estrous cycle of mice is about 4 days.
発情周期の各段階でホルモン濃度が変
Hormone levels change during each phase of the estrous cycle.