Table II.

The frequency of periodontal disease in 2 genotypes of blue color type minks examined (n = 289). Through the use of radiographs, periodontal disease was assessed in 1 randomly chosen half of the mandible from each mink by determining the alveolar bone loss and tooth loss of 4 selected teeth (premolar 3 [P3] and 4 [P4] and molar 1 [M1] and 2 [M2]). The frequency is presented as the percentage of mink categorized as affected by mild to moderate bone loss (defined by up to 50% alveolar bone loss related to 1 or more teeth) or severe bone loss (defined by more than 50% alveolar bone loss related to 1 or more teeth) versus non-affected animals. The percentage of blue mink with tooth loss (related to 1 or more teeth) in each genotype is also presented

Genotype	No bone loss	Mild to moderate bone loss	Severe bone loss	Tooth loss
Blue iris (n = 90)	17.8	61.1	21.1	13.3
Sapphire (n = 199)	12.0	73.9	14.1	14.6
P (genotype by bone loss)	—	0.091	—	—
P (genotype by tooth loss)	—	—	—	0.780