moulting season; molting season
Refers to the period when animals shed and replace their fur, feathers, or skin. Used in biological, veterinary, and pet-care contexts.
During a rabbit's moulting season, a lot of fur comes out.
Brushing is essential for dogs during their shedding season.
脱皮 is the shedding of skin or exoskeleton in reptiles and insects, not the seasonal fur change implied by 換毛期.
Compound of 換毛 (かんもう, 'moulting/molting') + 期 (き, 'period/season'). 換毛 itself combines 換 (exchange/change) and 毛 (fur/hair).