Prevalence of Swine Nematodes in Moscow, Russia

Abstract

To continue the fight against pig helminthiasis, a detailed analysis of the current prevalence of nematodes in these productive animals is required. The assessment of the material after the technological slaughter of pigs kept in the Moscow region revealed the presence of parasitization in their intestines of four nematodes (Ascaris suum, Metastrongylus spp., Trichocephalus spp., Strongyloides spp.) In the form of monoinvasion and any combination thereof. The total infestation of pigs with intestinal nematodes was 55.24%. Trichocytic invasion (Trichocephalus spp.) Occurred in pigs most often (23.77%), ascarous invasion (Ascaris suum) reached 22.38%, strongyloid invasion (Strongyloides spp.) Was noted in 9.09% of cases, metastrongylous (Metastrongylus spp.) was present in 1.75% of cases. In conditions of an increase in the severity of monoinvasion, the size of helminth eggs decreased in Trichuris: size in length by 5.9%, size in width by 7.4%, in Ascaris: length by 4.9%, width by 4.6%, in strongulata eggs a decrease in size is also noted. In the case of mixed Ascaris-Metastrongylous invasion, there was a clear antagonistic relationship, manifested in a decrease in the size of Ascaris eggs. The size of the eggs of Trichuris in the case of an invasion mixed with Ascaris decreased, which is apparently associated with the development of antagonism between them. Comparative analysis of information on the prevalence of nematodes in pigs in farms of the Moscow region and their size can help to increase the effectiveness of treatment and prophylactic measures against helminthiasis, and can be taken into account in the course of further examination of pigs in the Moscow.