For the electrocardiographic evaluation of Mangalarga Marchador breed horses, 60 electrocardiograms were recorded from clinically healthy equines aging from one to 28-year-old, being 39 females and 21 males. The heart rate tended to decrease with age and the amplitude of P wave increased with the growth of the animals. The duration of the QRS complex and the amplitude of S wave were greater in males than in females.
horse; electrocardiogram; Mangalarga Marchador breed
