I ran across these two articles and video this past week, the studies that are being done in Ireland are fascinating! They are tracing the genetic origin of TB speed - looks like it was a Shetland!  

The video gets at the question of "just what makes a champion?" - going through the mechanics* of a racing TB to discover just what makes these huge animals so fast, and what factors identify the ones that are truly incredible athletes. 
  
Articles:
http://www.irishexaminer.com/breakingnews/sport/irish-scientist-traces-racehorse-speed-to-ponies-537143.html
http://www.horsetalk.co.nz/news/2012/01/200.shtml

  Video:
http://www.youtube.com/watch?feature=player_embedded&v=QsvS6gEBJuE

*If you are very squeamish, I would not suggest watching the video without preparing yourself - just a word to the wise - it is an excellent exploration and very worth watching, but does involve the majority of an equine necropsy. 

Enjoy!
 


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