Ferrets bred commercially for the pet trade are often produced in conditions that cause adrenal disease and insulinoma at epidemic rates — health problems strongly linked to photoperiod manipulation and early spaying.
The epidemic of adrenal disease and insulinoma in North American ferrets is not a random misfortune but a predictable consequence of commercial breeding practices — early spaying and artificial light exposure that disrupts hormonal development. Each ferret with adrenal disease experiences a progressive decline including hair loss, muscle wasting, and eventually organ failure. The suffering is preventable through later spaying protocols that European ferret populations demonstrate are commercially viable.