Join Date: Feb 2012
Location: Neither here nor there
• Horses: 0
I am not sure if it is the same in horses as dogs, but in dogs some types of heart murmurs are genetic and others are not. In dogs they can do an echocardiograph to see what type of murmur a dog has to know if it is safe to breed the dog.
My dog has a mild heart murmur, which was deemed to be non-genetic. She had two litters, produced two "top 20" pups in the conformation ring in my breed, plus multiple performance titles including a MACH and a Grand Champion. None of the pups have any heart problems (out of 12 puppies). My dog is now 12 years old and in exceptional health for her age (she, herself is a champion with performance titles and she still enjoys agility). Fortunately her heart murmur has had very little impact on her leading a full and productive life. If the tests had shown her heart murmur to be caused by genetics I would not have bred her.
So if there is a way to test the cause of the murmur and it was deemed as non-genetic and the mare has excelled in other ways I would not necessarily rule her out. It also depends how severe the murmur is and whether it could possibly endanger her life.
Last edited by Tryst; 08-21-2013 at 04:35 PM.