This article provides a detailed description of both the method and the requirements for an infusion in the ear veinof cattle, performed in daily practice. By using this approach, calves and cows can be given larger quantities of fluidduring a longer period of time. Besides the ear anatomy, a description of the infusion technique is outlined. Thistechnique is easy to learn and can, according to the experiences of the authors, be used under field conditions at lowcost and with a minimal risk of complications.