The problem of anthelminthic resistance in horse breeding

The purpose of the research is to outline the growing problem of anthelmintic resistance of horse nematodes in the world, to describe the methods currently used to detect it, and the proposed ways to overcome it.Materials and methods. A review of the world literature on the resistance of horse nematodes to anthelmintic drugs is carried out.Results and discussion. Currently, veterinary parasitology is faced with the growing problem of the emergence of resistant races of helminths, against which previously tested anthelmintic drugs in recommended doses are ineffective. This phenomenon has been noted in many animal species and manifests itself in relation to many drugs of the main groups of anthelmintics. This is evidenced by numerous reports. In horse breeding, benzimidazoles have been used for over 40 years, leading to widespread resistance to them in intestinal nematodes. There is a loss or weakening of the effectiveness of treatment of nematodes of horses with anthelmintic drugs: thiabendazole, pyrantel pamoat, drugs from the benzimidazole groups and macrocyclic lactones. There is no doubt that a similar situation of the spread of resistant races of helminths is also typical for Russia, since here the same anthelmintic drugs are used for treatment as abroad. However, this problem in our country remains practically unexplored. In this situation, the uncontrolled use of anthelmintics, which does not take into account the possibility of resistance to them, inevitably leads (and possibly in some cases has already led) to the emergence and spread of resistant populations of helminths, against which existing drugs will be ineffective.