[Prevalence of cardiac murmurs in clinically healthy horses of riding schools [Shiraz, Isfahan and Tehran]]

To determine the prevalence of cardiac murmurs in clinically healthy horses of riding schools [Shiraz, Isfahan and Tehran]. Field Study. Five hundred and twenty six horses [475 sporting and 51 non-sporting horses]. Horses were divided into: sporting horses [jumping, race, endurance, training], non-sporting horses [foals, pleasure] and two different age groups:>2 and 2 years old was significantly greater than horses 2 years old can be related with increase in the prevalence of systolic murmurs on the tricuspid valve. This finding may be due to the effect of training and occurrence of eccentric cardiac hypertrophy