Behavioral Disorders and Cannibalism
The fur industry often claims that mink kept on mink farms are bred to thrive in the cage environment. There is no evidence to support this claim. Instead, research shows that the behaviors and needs of farmed mink largely overlap with those of wild mink.(6) No species has been bred to thrive in cages, no matter how tame they are.
Some of the animal welfare problems that occur on fur farms are that minks exhibit self-mutilation, cannibalism and other behavioral disorders that indicate that they are in extremely poor condition.(7) The most common behavioral disorder found, in a study of Swedish minks, was pacing back and forth along the cage wall.(8) Other welfare problems that have been documented on mink farms include fur biting, as they are never allowed to chew their food (9) and boredom.(10)
Research has shown that passive mink may have higher levels of stress hormones than those that exhibit behavioral disorders.(11) Thus, the docile animals on mink farms may be the ones who suffer the most because they have no outlet for the stress they build up. Despite this, mink farms often breed from the most docile individuals.(12)
Small changes to the cages, such as the addition of toys or shelves, have not been shown to make a sufficient difference when mink are still in small cages.(8, 13) On the other hand, stereotypes and behavioral disturbances are unlikely to occur when mink are given much more space and access to water.(6) This is a type of animal husbandry that is not economically feasible for the fur industry.