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Horses/big heart horses - good performers

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Question
hello ma'am. i heard that horses that have bigger hearts are good performers. is it true? may i know how to pick a horse has a bigger heart?

Answer
Roberts,
  There is a thing called an X factor that leads to over sized, healthy hearts. There are several books that can explain it much better than I can. Since it is located on the X chromosome, it must be passed on through the dam, and a sire can only pass it to his daughters.
  When most people talk about horses with large hearts or a lot of heart, it usually has nothing to do with the actual heart. It has to do with how much courage a horse has. Unfortunately, there is no way to know this till your horse faces some adverse conditions.
Anne Stepien

Horses

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Anne Stepien

Expertise

I am knowledgeable regarding Standardbred race horses (trotters and pacers). I can answer general questions, questions regarding conformation, rigging, lameness and some shoeing questions.

Experience

I raced standardbreds (primarily trotters) for 9 years on the Grand Circuit and in overnight events for approximately 15 years.

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