TY - SER AU - Silva,M.da G.Q.e AU - Silva,A.V.M. AU - Costa,H.M.de A. TI - Dictyocaulus arnfieldi (Cobbold, 1884): comparative analysis of the occurence in horses, mules and donkeys KW - CAVALO KW - BURRO KW - MULA KW - INFECÇÃO KW - DOENÇA ANIMAL ER -