title: Hoof growth and wear of semi-feral ponies during an annual summer 'self-trimming' period.
abstract: BACKGROUND
  Despite growing interest in application natural models of hoof-maintenance in domestic horses, little data is available to describe natural conformation and proposed mechanisms of self-maintenance.
  
  
  OBJECTIVE
  Quantitatively describe hoof growth and wear during a period of 'self-trimming' within a herd of semi-feral ponies.
  
  
  METHODS
  Hoof length, growth and wear were measured for a sample of 40 animals during a period of 'self-trimming' from June through September, 2005.
  
  
  RESULTS
  For front hooves, mean toe lengths in July, August and September were significantly less than in June. For the hind, mean toe length in August was significantly less than in June, July and September. Increased rate of wear, as opposed to decreased growth rate, was the major contributor to overall shorter hoof lengths. Cumulative wear expressed as a percentage of the June baseline toe length ranged from 21-57% (mean 38%) for the front and 12-46% (mean 32%) for the hind.
  
  
  CONCLUSIONS
  Significant cracking, tearing and increased wear, known as 'self-trimming' is a measurable herd-wise phenomenon in horses maintained under natural social and environmental conditions.
  
  
  CONCLUSIONS
  Although just one example herd, these data provide quantitative support of anecdotal reports of 'self-trimming' as a mechanism contributing to natural self-maintenance of the equine hoof.
authors.affiliation: University of Pennsylvania, School of Veterinary Medicine, New Bolton Center, 382 West Street Road, Kennett Square, Pennsylvania 19348, USA.
authors.forename: L
authors.initials: L
authors.lastname: Florence
authors.forename: S M
authors.initials: SM
authors.lastname: McDonnell
mesh_terms: D000818:Animals; D001696:Biomechanical Phenomena; D005260:Female; D006724:Hoof and Claw / Q000033:anatomy & histology* / Q000254:growth & development / Q000502:physiology*; D006736:Horses / Q000033:anatomy & histology* / Q000502:physiology*; D008297:Male; D011312:Pressure; D012621:Seasons; D013997:Time Factors