Which factor plays a key role in the shedding of hair in animals?

Lighting plays a crucial role in the shedding of hair in animals, as it directly influences the endogenous rhythms and seasonal responses of many species. In many cases, changes in daylight hours signal to animals when to prepare for changing seasons. For example, increased daylight during spring can trigger molting processes, where animals shed their winter coats to adapt to warmer temperatures. Conversely, shorter daylight hours in fall and winter can lead to the development of thicker fur or feathers in preparation for cold conditions.

While temperature, humidity, and diet can have effects on the health and condition of an animal’s coat, as well as influence the timing of shedding to some extent, the primary driver for seasonal shedding typically involves light exposure. It adjusts physiological processes that control growth cycles of hair and fur, making lighting a fundamental factor in this biological response.