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Effect Of Amitraz And Xylazine On Some Physiological Variables Of Horses, A. Queiroz-Neto, A. B. Carregaro, G. Zamur, J Daniel Harkins, Thomas Tobin, M. I. Mataqueiro, S. C. Gonçalves

Maxwell H. Gluck Equine Research Center Faculty Publications

The effect of the intravenous injection of amitraz (0.1 mg/kg) to horses on cardiac activity, respiratory rate, intestinal motor activity, rectal temperature, sweating and masticating was evaluated and compared to the effect of intravenous administration of xylazine (1mg/kg, iv) on heart rate, respiratory rate and intestinal activity. Amitraz caused a significant decrease in heart activity, respiratory rate and intestinal movements, but these effects were not as pronounced as those caused by xylazine. Amitraz also caused a significant relaxation of the rectal smooth muscle, and an apparent increase in sweating and in the frequency of horses found masticating hay. Rectal temperature …