Portal de Periódicos da CAPES

Prophylactic use of ivermectin against cattle myiasis caused by Cochliomyia hominivorax (Coquerel, 1858)

1997; Elsevier BV; Volume: 72; Issue: 2 Linguagem: Inglês

10.1016/s0304-4017(97)00018-6

1873-2550

C. Benítez Usher, Jurandir Ferreira da Cruz, Luís Carvalho, A.A. Bridi, Daniel O. Farrington, RA BARRICK, J.S. Eagleson,

Insect and Pesticide Research

The prophylactic efficacy of ivermectin against navel or scrotal myiasis in calves was evaluated in eight trials in Argentina and Brazil. In two trials, calves were injected subcutaneously with ivermectin at a dosage of at least 200m μ g kg−1 within 24h of birth. In other six trials, two with two-month-old calves and four-month-old or older calves, all calves were treated with ivermectin at a dosage of at least 200 μ g kg−1 immediately after castration. In all trials, calves were maintained together on pasture and naturally exposed to Cochliomyia hominivorax. Naval and scrotal wounds were examined for myiasis daily for at least 14 days. Incidence of navel and scrotal myiasis was significantly lower (P < 0.01) in treated calves than in control calves.