title: Effect of dam and sire qualitative hip conformation scores on progeny hip conformation.
abstract: OBJECTIVE
  To determine in dogs what effect using hip conformation scores assigned by the Orthopedic Foundation for Animals (OFA) as a criterion for breeding selections would have on hip conformation scores of the progeny.
  
  
  METHODS
  Longitudinal study.
  
  
  METHODS
  English Setters, Portuguese Water Dogs, Chinese Shar-peis, and Bernese Mountain Dogs for which OFA hip conformation scores were known.
  
  
  METHODS
  Pedigree data were obtained from the national breed clubs and the American Kennel Club and merged with data from the OFA hip conformation score database. An ANOVA was used to evaluate the effects of sex, age at the time of radiographic evaluation, and year of birth on the variation in hip conformation scores among the progeny. Heritability was estimated by use of within-year midparent offspring regression analyses.
  
  
  RESULTS
  Significant differences in progeny hip conformation scores between sexes were not detected, but age at the time of radiographic evaluation and year of birth had a significant effect on hip joint conformation of the progeny. Estimated heritability (mean +/- SE) was 0.26 +/- 0.03, and dam and sire hip conformation scores had a significant effect on progeny hip conformation scores. Annual decreases in percentage of dysplastic progeny and increases in percentages of progeny and breeding dogs with phenotypically normal hip joint conformation were detected.
  
  
  CONCLUSIONS
  Results indicated that hip conformation scores have moderate heritability in dogs and selection of breeding stock with better hip conformation scores will increase the percentage of progeny with phenotypically normal hip joint conformation.
authors.affiliation: Orthopedic Foundation for Animals, Columbia, MO 65201, USA.
authors.forename: A L
authors.initials: AL
authors.lastname: Reed
authors.forename: G G
authors.initials: GG
authors.lastname: Keller
authors.forename: D W
authors.initials: DW
authors.lastname: Vogt
authors.forename: M R
authors.initials: MR
authors.lastname: Ellersieck
authors.forename: E A
authors.initials: EA
authors.lastname: Corley
mesh_terms: D000367:Age Factors; D000818:Animals; D001947:Breeding / Q000592:standards*; D016208:Databases, Factual; D004285:Dogs; D005260:Female; D006619:Hip Dysplasia, Canine / Q000235:genetics*; D008137:Longitudinal Studies; D008297:Male; D012044:Regression Analysis; D012737:Sex Factors