Inheritance of dermoid sinus in the Rhodesian ridgeback.
OBJECTIVE
TO define the mode of inheritance of dermoid sinus.


METHODS
A chi-squared analysis was performed on data from 46 litters produced between 1990 and 2001. Data were corrected to avoid bias in the segregation ratio.


RESULTS
In data from 57 litters (n=492), 82 dermoid sinus positive offspring were observed. The frequency of affected offspring in the Swedish Rhodesian ridgeback population is estimated to be between 8 and 10 per cent.


CONCLUSIONS
Bias in heredity pattern may be caused by undetected dermoid sinus type V. Improved clinical diagnosis of all dermoid sinus types is therefore crucial.
Hillbertz
N H C Salmon
NH
Swedish University of Agricultural Sciences, Department of Animal Breeding and Genetics, Biomedical Centre, Box 597, S-751 24, Uppsala.
D000818:Animals; D004283:Dog Diseases / Q000175:diagnosis* / Q000235:genetics / Q000473:pathology; D004285:Dogs; D005260:Female; D020022:Genetic Predisposition to Disease; D008297:Male; D010375:Pedigree; D016136:Spina Bifida Occulta / Q000175:diagnosis / Q000662:veterinary*; D013548:Sweden