AVALIAÇÃO DA COMBINAÇÃO DE DIAZINON + FIPRONIL EM RELAÇÃO A UTILIZAÇÃO DO DIAZINON NO CONTROLE DE MOSCA-DOS-CHIFRES (HAEMATOBIA IRRITANS) EM BOVINOS DE CORTE – RELATO DE CASO

Abstract

Cattle farming faces challenges related to ectoparasites that directly affect the productive performance of animals. Haematobia irritans, known as the horn fly, is a hematophagous ectoparasite widely distributed in tropical and subtropical regions. This study reports the experience of a farm located in Porangatu, Goiás, in which the efficacy of an insecticide ear tag containing diazinon was evaluated in relation to a combination of diazinon + fipronil, analyzing its action in controlling the infestation and in the zootechnical performance of the animals. The study was conducted between September 2024 and March 2025, in a herd of crossbred cattle, intended for rearing. Two batches were evaluated: one treated only with earrings containing diazinon and the other with earrings containing the combination of diazinon + fipronil. Monitoring included measuring the average daily gain (ADG) of the animals and visual observation of the infestation at different times of the day. The results indicated that, although the batch treated with diazinon had a higher final average weight (269.2 kg versus 247.7 kg of the batch treated with diazinon + fipronil), the ADG of the group treated with the combination was significantly higher (0.776 kg/day versus 0.501 kg/day). This finding suggests that the use of the combination of diazinon + fipronil reduced the infestation more efficiently, resulting in better productive performance throughout the developed period.