Diagnosis of canine hip dysplasia and selection against this trait.

N, the Norberg-Olsson value, when regarded as the single predictor of FS in the total research subpopulation, leads to an unacceptably high proportion of misclassifications. These misclassifications are found to be much reduced in number on elimination of all animals suffering from bone deformities (BD) as perceivable on the radiographs. Discriminant analysis, applied to the findings in 915 Rottweilers, yields the combination of a suitable high N with the absence of perceivable bone deformities as a more acceptable predictor for FS, specially applicable in borderline cases.