**Acknowledgements**

The technical assistance of Mr. Dias Nolan, veterinary student, is greatly appreciated. Thanks are extended to Ms. Carmel Prins, veterinary student, for typing the manuscript, to Dr. V. Vijayalakshmi, veterinary post-graduate student, for assisting in all the procedures involved in obtaining the required ECG readings. The authors extend their sincere gratitude to the Department of Veterinary Medicine and the Dean, Rajiv Gandhi Institute of Veterinary Education and Research, Puducherry.
