title: Effects of various presale radiographic findings for yearling Thoroughbreds on 2-year-old racing performance.
abstract: OBJECTIVE
  To determine the effects of various presale radiographic findings for Thoroughbreds sold at a yearling sale on 2-year-old racing performance of those horses.
  
  
  METHODS
  397 Thoroughbreds.
  
  
  METHODS
  Cohort study.
  
  
  METHODS
  Thoroughbreds offered for sale at a Thoroughbred sales facility in Kentucky were selected via a randomization procedure. Effects of various presale radiographic findings on the following measures of 2-year-old racing performance were determined: having started a race and having placed (ie, finished in first, second, or third place) in a race at least once, total amount of money earned, and amount of money earned per start.
  
  
  RESULTS
  Of the 397 horses, 192 (48%) started in at least 1 race during the 2-year-old racing year. The odds of failure to start a race as a 2-year-old were 1.78 times as great for horses with forelimb proximal sesamoid bone osteophytes or enthesophytes as for horses without this finding (95% confidence interval, 1.01 to 3.16). The odds of failure to start a race as a 2-year-old were 2.02 times as great for horses with hind limb proximal phalanx osteochondral fragments as for horses without this finding (95% confidence interval, 0.95 to 4.31), although this result was not significant. Radiographic findings did not have an effect on total amount of money earned, amount of money earned per start, or whether horses placed in a race.
  
  
  CONCLUSIONS
  Presale radiographic detection of forelimb proximal sesamoid bone osteophytes or enthesophytes or hind limb proximal phalanx osteochondral fragments in yearlings were associated with failure to start a race during the 2-year-old racing year in study horses.
authors.affiliation: Department of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL 32610.
authors.forename: Stephanie A
authors.initials: SA
authors.lastname: Preston
authors.forename: Murray P
authors.initials: MP
authors.lastname: Brown
authors.forename: Troy N
authors.initials: TN
authors.lastname: Trumble
authors.forename: Terese L
authors.initials: TL
authors.lastname: Chmielewski
authors.forename: Dana N
authors.initials: DN
authors.lastname: Zimmel
authors.forename: Jorge A
authors.initials: JA
authors.lastname: Hernandez
mesh_terms: D000818:Animals; D002350:Carpus, Animal / Q000000981:diagnostic imaging; D003132:Commerce; D005260:Female; D006734:Horse Diseases / Q000000981:diagnostic imaging* / Q000473:pathology; D006736:Horses; D008297:Male; D010805:Physical Conditioning, Animal; D011859:Radiography; D013177:Sports; D013264:Stifle; D013643:Tarsus, Animal / Q000000981:diagnostic imaging