1Department of Clinical Sciences, Faculty of Veterinary Medicine, Sanandaj Branch, Islamic Azad University, Sanandaj, Iran
2Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
3Department of Clinical Sciences, School of Veterinary Medicine, Shiraz University, Shiraz, Iran
Electrocardiographic study of 50 healthy Markhoz goats ranging from less than 1 to more than 3 years in age was carried out. The heart rate varied from 99 to 123 beats/min with a mean of 110 beats/min. There was a significant difference between the heart rate of goats in 3 age groups (PT waves and QT interval in base apex lead, QRS wave in lead I, P-R and PQ interval in aVF lead were higher and duration of QRS and T waves in aVR lead, P wave in lead III, PQ and P-R intervals in lead II and QT interval in aVR lead were lower than those in the other leads. The mean duration of QT interval had significant changes with age (P<0.05).