Cattle thelaziasis is widespread on many continents. The disease is characterized by damage to the organs of vision, the development of conjunctivitis, keratitis and corneal ulcers, the development of panophthalmia is often observed, and therefore, animals are culled. Since the vector of invasion is zoophilic flies, it is rational to carry out insecticidal treatments for the prevention of vegetation during the pasture period. To protect animals from zoophilic flies, we studied the insecticidal activity of the drug «Abifipr», which consists of fipronil and abamectin, which allows to deal with resistant populations of flies. Studies were conducted in 2012-2014. in the farms of the Tyumen region, located in the forest-steppe climatic zone. When selecting an effective dosage, «Abifipr» was tested in doses of 1.0; 2.5; 5.0; 7.5 and 10.0 ml by local application to or behind elevations between the horns. Counting for the number of zoophilic flies around the eyes was carried out during 3 minutes before treatment and after 4, 12, 24, 36, 48, 60, 72, 84, 96, 108 and 120 hours after treatment, after which the coefficient of protective action was calculated. Our research has shown that a local application of «Abifipr» in a dose of 5.0 ml with an interval of 7-10 days in a low population of zoophilic flies and once every five days in periods of high abundance of zoophilic flies, has a high protective effect against zoophilic flies-intermediate hosts of Thelazia. The cost of insecticidal treatments per animal for the entire period of parasitizm of zoophilic flies amounted to 794.92 rubles.