Table III.

The frequency of periodontal disease in commercially bred blue color type mink (n = 289) from 5 Danish mink farms. The percentage of young mink (7 mo) among the mink obtained from each farm is presented. 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 animals categorized as affected by mild to moderate bone loss (defined by less than 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

Farm identification	n	Percentage of mink aged 7 mo	Mild to moderate bone loss	Severe bone loss	Tooth loss
1	24	100	70.8	0	0
2	65	39.5	52.3	29.2	18.5
3	50	0	90	8	24
4	75	33.3	66.7	21.3	17.3
5	75	33.3	74.7	10.7	5.3
P (frequency by farm)	—	—	0.001	0.001	0.006
P (frequency by age)	—	—	0.001	0.001	0.001