Abstract
The purpose of this work is to compare the insect repellent efficacy of drugs in the protection of cattle from zoophilous flies in eastern Kazakhstan. The study was carried out in the summer in the field, during the period of the mass flight of flies, in three groups of cattle. Animals were treated by spraying. The two most commonly used preparations, Cypec 25%, Flyblock, were compared according to the attached instructions for use. The guide to the drugs indicates a period of validity of 20 days. As a result of the study, it was found that one of the drugs showed the best efficiency, up to 9 days after treatment. The analysis showed a significance level of p < 0.001. Thus, for effective protection of animals from ectoparasites, it is necessary to take into account not the periods indicated on the preparation, but the period of action on insects directly on the farm, because ectoparasites acquire resistance to insecticides.