The epizootic situation of intestinal nematodes was studied in some farms of the Republic of Tatarstan. The object of the study was horses of different age groups, breeds, sexes, spontaneously – infested with nematodoses. When studying the epi-zootological situation, indicators of extensed invasion (EI) and intensed invasion (II) were used, which were determined by studying the faeces of animals by the hel-minthic scattering modified Kotelnikov-Khrenov method. In 2016, 32 animals were studied for intestinal nematodoses of horses in the amount of 32 Nurlat stud farm limited liability company of Nurlat district of the Republic of Tatarstan. Extensed invasion of stronghylazoses amounted to 40.6%, with the intensity of invasiveness from 7.6 to 1816.4 spec. eggs in 1 g of feces, the intensity of invasion by mixed inva-sion (strongilitoza of the digestive tract + parascariosis) was 21.9%, with a degree of invasion from 15.2 to 3777.2 eggs of the nematode of the Strongylata suborder and from 22.8 to 1603.6 eggs Parascaris Eguorum in 1 gram of feces. When examining 22 horses in 2019, the Khamitov RM farm was found that the horses examined were free from helminths. During the examination of 10 horses of PL “Alekseevskoye”, it was revealed that 10 animals were infested with strongyloses of the digestive tract (EI-100%). The intensity of the invasiveness of horses by the pathogens of the strut of the digestive tract ranged from 15.2-296.4 eggs per gram of feces. In FF "Avza-lov G.G." of Aktanyshsky district of the Republic of Tatarstan, the extensiveness of horses with strongholds of the digestive tract was 40%, with intensed invasion from 15.2 to 273.6 eggs per 1 gram of faeces, extensed invasion with helminths from the sub-order Strongylata + Parascaris, 7%, with a degree of invasion – 395.2 eggs of ematodes of the suborder Strongylata and from 258.4 eggs of P. eguorum in 1 gram of feces. And the animals of the Khamitova RM farm were free from nematodes.
The evolution of biological systems on the example of changes in anthropometric indicators of the three age groups of pupils Ugra and Bashkortostan Republic from the perspective of theory of chaos and self-organization is considered. The kinematic parameters of complex systems (systems of third type) based on the motion simulation system of the state vector x(t) in the phase space of state were calculated. A special mathematical apparatus for calculation of the centers of quasi-attractors (areas of phase space in which x(t) changes continuously) and the rate of evolution was used. The authors demonstrated the calculations of the quasi-attractors’ volumes, the coordinates of their centers, as well as the velocity of these centers and the rate of evolution of biological systems in the phase space of states. A comparative analysis of the kinematic characteristics of students of Ugra and Bashkortostan Republic showed significant differences in the dynamics of anthropometric parameters.
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