Efeitos da administração epidural de amitraz, xilazina ou dimetil sulfóxido em vacas

Avaliaram-se os efeitos da injecao epidural de amitraz (0,4mg/kg), xilazina (0,05mg/kg) ou dimetil sulfoxido 10% (5,0ml) sobre a frequencia cardiaca (FC), pressao arterial sistolica (PAS), frequencia respiratoria (FR), motilidade ruminal (MR), temperatura retal (TR), altura de cabeca (AC) e latencia das respostas a estimulos nociceptivos nas regioes da coxa (LECC) e coroa do casco (LRRM) de vacas. Houve diminuicao da FC e da MR nos grupos xilazina e amitraz. O tratamento com xilazina resultou em alteracoes na FR, PAS e AC. LECC e LRRM foram maiores nos tratamentos com agonistas a-2. Nas doses utilizadas, o amitraz aumentou a latencia de resposta a estimulo nociceptivo em menor grau que a xilazina, sem induzir efeitos colaterais sistemicos severos, em vacas.

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