Abstract: The article presents the results of studies of laboratory and field germination of seeds of the genus Parthenocíssus L. in the conditions of the Zalarinsky district. For plants of the Siberian regions, such signs as winter hardiness and frost resistance, quality seed attributes, the rhythm of seasonal development, and the ability of plants to bear fruit are important. The studies were carried out during the vegetation period of plants from 2015-2018 in a personal plot located in the territory of Zalari, Zalarinsky district. The objects of research were seeds, seedlings, and seedlings of P. quinquefolia cultivar ―Don Juan‖ grown in the Zalarinsky district and seeds of the ―Gavrish‖ company. In the conditions of the Zalarinsky district, the fruits ripened in the middle of September. To research seed propagation under laboratory conditions, seeds collected from annual plants in the second decade of October 2016 were used. After collecting the fruits, the seeds were washed, cleaned from the pericarp and placed on a four-month stratification in the refrigerator at a temperature of +6°С. At the final stage of artificial stratification (in the first decade of March 2017), the seeds were soaked for 1 hour in various growth stimulants (aloe juice, ―Epin‖) and distilled water. The weight of 1000 seeds of P. quinquefolia was 18.9 - 24 g, while the weight of 1000 seeds collected from existing plantings in the Zalarinsky district was 18.9 g, the weight of 1000 seeds of ―Gavrish‖ company was 24 g. Using the natural stratification of seeds of P. quinquefolia conditions of the Zalarinsky district gave positive results in the form of friendly seedlings in the second half of May 2017. Field germination of seeds was 46%. As a result of natural and artificial stratification, the germination rate of P. quinquefolia seeds was 46 and 41 percent, respectively. The beginning of seed germination occurred a week after stratification. The percentage of sprouted seeds acquired by epin exceeded the control by 58.5%. Rootin use increased the rooting percentage of lignified cuttings of P. quinquefolia by a factor of 1.6. The winter hardiness research of P. quinquefolia showed that after wintering the plants had a slight darkening of the wood (yellowish), slight burns of the bark on the trunk and skeletal branches, drying out of a part of the annual growths and single attacks of small branches; vines are well leafed, which corresponds to damage in 1 point.

Keywords: Parthenocíssus quinquefolia, vertical gardening, decorative deciduous, vines, seed germination, stratification, winter hardiness.

Abstract: The studies were carried out on former arable gray forest soils located in the forest-steppe zone of the Irkutsk region (Zalarinsky district), which at different times were withdrawn from agricultural circulation. An assessment is made of their humus status in the forest-steppe zone of the Prebaikalia during their post-agrogenic development (arable land - a fallow of 4 years - a fallow of 15 years - a forest). It was established that the carbon content and reserves in the upper 20-cm soil layer increased with increasing age of the fallow and reached a maximum value in the forest cenosis soil. Active transformations in the fractional group composition of humus were observed, associated with the redistribution of carbon between the individual fractions of HA and FA. However, the type of humus of the studied soils remained fulvate-humate, and the degree of humification was ―high‖ and ―very high‖. This indicates the preservation of the zonal composition of humus in the gray forest soils of the region during their post-agrogenic development. An increase in the age of the fallow was accompanied by an increase in the labile part of humus. Thus, the proportion of mobile humic substances (С0.1NaOH) varied from 0.32% to 1.24% of the soil mass and reached the highest value in the variants of the 15-year-old fallow and forest. The content of easily transformable carbon was changed in the same sequence. The data obtained make it possible to assess the direction and intensity of the processes of transformation of humic substances in the gray forest soils of the region that are in fallows and the prospects for their further use, including when returning to agricultural production.

Keywords: gray forest soil, qualitative composition of humus, carbon reserves, fallow.

Abstract: The article presents the results of a survey of green spaces of squares in the territory of three administrative districts of Ulan-Ude-Zheleznodorozhny, Oktyabrsky and Sovetsky. As a result of a reconnaissance survey in the territory of the studied squares, data were obtained on the boundaries and area of the studied green areas, the total number of trees, the area occupied by trees, shrubs, lawns, or natural vegetation and flower beds, as well as information on the current state of green spaces. As a result of the inventory of green spaces in the squares of Ulan-Ude, it was revealed that the species composition of trees and shrubs includes 33 species belonging to 27 genera and 13 families. The largest number of species found in the studied squares is represented by the Rosaceae family. The share of the main species of trees and shrubs in the structure of green spaces of the studied squares was determined. The biometric indicators of trees (height, trunk diameter), and the closeness of the stands were studied. The age structure was determined at each landscaping object of tree and shrub species, and a category of condition was assigned to each tree and shrub species according to the existing scale of status categories. Based on the studies, it was found that the main reasons for the deterioration of urban green spaces in the studied squares of Ulan-Ude are: violation of the technology of planting seedlings, lack of a regular watering system, insufficient care, damage by diseases and pests, a high degree of anthropogenic load in the territory investigated squares, resulting in numerous mechanical damage.

Keywords: urban green spaces, tree and shrub species, inventory, category of status, square.

Abstract: The development of intensive technology for the cultivation of potatoes in the Tyumen region in the second half of the 20th and beginning of the 21st centuries led to an increase in the average regional yield from 12-14 t/ha to 22-25 t/ha. The reported yield was achieved mainly due to mineral fertilizers and chemical plant protection products. In recent years, the variety’s contribution to crop yields has increased. Moreover, varieties of Dutch and German breeding are increasingly being included in the register of selection achievements of the region. Their cultivation is accompanied by the constant growth of used chemical plant protection products, which is dangerous for the environment and human health. Along with intensive technology, the GAU of Northern Trans-Urals has developed the scientific basis for organic potato growing. In this case, the main importance is attached to the variety. The article analyzes the test results in a competitive nursery of breeding lines isolated from hybrid combinations of crossbreeding varieties created by scientific institutions of the country with the participation of 2-5 wild potato species. It was established that in conditions of organic farming, without the use of mineral fertilizers and chemical plant protection products, potato breeding lines from hybrid combinations ―Spring‖ x ―Ogonyok‖ and ―Gusar‖ x ―Pushkinets‖ in 2017-2019. formed tuber productivity of 26.2-31.7 t/ha with a marketability of 85.1-93.0%, starch content of 13.1-16.4% and a flavor rating of 3.8-4.6 points. The tubers were well stored in the winter. For the development of organic potato growing in the Tyumen region there are natural resources: stocks of peat, sapropel, organic fertilizers (manure, green manure), biological products. Breeding is developing, the testing of domestic and foreign varieties is ongoing at the variety testing site, from which the best varieties are selected for cultivation in conditions of organic farming.

Keywords: organic potato growing, variety, breeding line, yield, quality of tubers.

Abstract: The article presents the results of studies of allelopathic mutual relations between the seeds of perennial plants: Eastern Goat's Rue, Eastern swerbig, Highlander spread and widely distributed boneless rump, used in the Prebaikalia to create multicomponent joint agrophytocenoses. The presence of stimulating and inhibiting biochemical interactions between the seeds of perennial plants in the early stages of growth and development with joint germination was revealed. With the joint germination of seeds of biotest plants - spring wheat and oil radish in Petri dishes, the laboratory germination of biotest plants varied greatly. A sharp decrease in laboratory germination of wheat seeds was noted when it was germinated jointly with the seeds of Eastern Goat's Rue. Laboratory germination of wheat seeds in relation to control decreased by 26.5%. On the contrary, secretions of the seeds of the mountaineer spread wide positively influenced the germination of both wheat and oil radish. Oilseed seeds responded positively to the presence and excretion of seeds of perennial herbs. Germination of oil radish in all variants of the experiment was higher than control. A slight inhibitory effect on the germination of oil radish was noted on the side of the eastern Goat's Rue. The germination of boneless rump in the presence of oriental Goat's Rue seed was 33.4% lower than the control. Slight oppression on the germination of the seeds of the boneless rump was observed from the side of wheat. It is noted that the seeds of the eastern swerbigi do not germinate in laboratory conditions. However, the field germination of the Eastern Sverbigi is good. Eastern Goat's Rue and mountaineer spread wide had low laboratory germination. The germination rate of the eastern Goat's Rue and the mountaineer spread open when jointly germinated with beefless rind, wheat and oilseed radish was lower than in the control variants. The highest inhibitory effect on germinating seeds of perennial plants was exerted by oilseed seeds. The germination ability of the seeds of the mountaineer widened was 47.2% lower, and seedlings of the Eastern Goat's Rue could not be obtained.

Keywords: eastern Goat's Rue, eastern swerbig, mountaineer spread wide, boneless rump, allelopathy, laboratory germination, biotest plants.

Abstract: The effect of the chemical composition of soils on the activity of nutrients — nitrogen and oxygen — was studied. The studies were carried out by the method of physicochemical modeling based on the software package ―Selector‖. The following system performance indicators were calculated: the Gibbs energy of the system, the chemical potentials of the corresponding independent components, the number of solution components, the number of solid phases, the amount of emitted gases, the pH of the solution, and the redox potential of the system. The results obtained in the work allow us to conclude that clay soils increase the reactivity of oxygen, with the most significant increase in the reactivity of oxygen observed in systems containing limestone and slaked lime. To a lesser extent, the clay soil has a positive effect on oxygen activity in the presence of potassium fertilizer, and the minimal effect for the systems under study is observed in mixtures involving ammonium nitrate. Sandy soils do not affect the activity of oxygen, and, thus, are, in fact, an inert medium, the nature and intensity of metabolic processes in which are determined by other participants in the studied thermodynamic systems. In this regard, the effectiveness of mineral fertilizers that determine the activity of oxygen on sandy soils decreases in the series: calcium carbonate - calcium hydroxide - calcium dihydroorthophosphate - potassium chloride - ammonium nitrate. It can be assumed that it is calcium ions contained in the compounds that have a pronounced positive effect on oxygen activity. Nitrogen activity decreases on clay soils. The greatest decrease is observed in clay soils containing hydrated lime, to a lesser extent - in soils containing limestone and double superphosphate, and the least unfavorable in this regard are soils containing ammonium nitrate. Sandy soils, due to their inertness, do not affect the chemical activity of nitrogen.

Keywords: physicochemical modeling, soil, mineral fertilizers, chemical potential

Abstract: For the first time in the pre-Baikal region, an introduction study of the drug lovage was carried out, the phenological phases of development were determined by years of life. Shoots of the lovage of the drug were noted 15-20 days after sowing. In the year of sowing, by the end of the growing season, the plants reached the stem phase and branches up to 20 cm, but did not form generative shoots. With lower temperatures in the second half of September, the death of leaves began, which ended by the end of October. In the second and third year of life, the lovage officinalis resumed vegetation in late April. By the middle of the May, the plants form a rosette of 7-9 leaves. Stem is in the phenological phase of development, plants enter at the beginning of June (2.06–5.06), full bloom is established in the first ten days of July, during this period the plants grow to a height of two meters. The flowering period lasts from 15 to 27 days. Fruiting is observed in late August. The vegetation ends on October 19-23. The introduced culture — the medicinal lovage — takes place in the conditions of the subtaiga – taiga zone of the Prebaikalia, all phenological phases of development and provides seed reproduction, which allows one to obtain own seeds for expanding crops of a valuable culture. The study of the sowing qualities of the seeds of this culture showed that the germination energy, laboratory and field germination rates are high: over the years of research, the germination energy was 90±5 - 93±4%, laboratory germination was in the range 94±2 - 97±4% , field germination - from 81±6 to 88±5%.

Keywords: medicinal lovage, phenological phases of development, the beginning of the growing season, stem, flowering, fruiting, germination energy, laboratory germination, field germination.

Abstract: The article presents the results of research on the use of modern herbicides and their tank mixtures in sowings of new varieties of spring wheat created in FSBSE ―Irkutsk SRIA‖. The soil of the experimental plot is gray forest heavy loamy, the content of humus in an arable layer 4.3-4.9 %, рНsоl. – 4.8-5.3. The seeding was made on 10 May with the seeding rate 7 mln. germinable seeds per hectare. Seedlings of wheat varieties emerged in 11-13 days after sowing. Field germination of seeds was 69.7-72.1 %. The crops were treated with herbicides in the middle of the second decade of June, during the tillering phase of wheat. At the moment of treatment in the sowings, the average number of weeds amounted 70.9 un./m2, including perennials – 10.2 %. After applying graminicides and their tank mixtures, bluegrass weeds were completely destroyed in 20-22 days. Dicotyledonous annual weeds were also killed by preparations containing biocides. Perennial weeds – corn sowthistle and common thistle proved to be more resilient: under the impact of herbicides their growth was restrained, they were suppressed and until the end of the vegetation period were in the lower level of sowings. Most of the studied pesticides and their tank mixtures gave high biological efficiency 80.1-83.6 %. The destruction of weeds promotes to more intensive growth and development of wheat plants and their preservation for harvesting. The outcomes of yield structure analysis showed that the use of herbicides increases the number of productive stems, the amount of kernels in an ear and the weight of 1000 grains. In the sowings of the ―Tulunskaya 11‖ variety, ―Granery‖ preparation, ―VDG‖ at a dose of 25 g/ha provided higher indicators. Weeding enabled to raise the number of productive stems by 38 un./m2, the amount of kernels in an ear – by 1.4 un., the weight of 1000 seeds – by 1 g in comparison to the control. In the sowings of ―Zoryana‖ cultivars the best characteristics of yield structural elements were marked with application of the tank mixture of ―Lastik TOP‖, ―МКE‖ 0.4 l/hа + ―Маgnum‖, ―VDG 8‖ l/hа. In the sowings of ―Маrsianka‖ and ―Stolypinka‖ varieties the herbicide ―Puma Plus‖, ―KE‖ at a dose 1.5 l/hа was more efficient. This preparation suppressed both bluegrass and dicotyledonous weedy plants. After application of it the indicators of yield structure elements have significantly increased. A little lower results were provided by the herbicides ―Granery‖, ―VDG‖, ―Lantselot ТМ 400‖, ―VDG‖ and the tank mixture ―Lastik TOP‖, ―МКE + Маgnum‖, ―VDG‖. Among the studied herbicides the least effect on weed contamination of sowings, plant growth and development of new cultivars of wheat and their yield structure was taken by ―Lastik TOP‖, ―МКE‖ at a dose 0.5 l/hа.

Keywords: cultivar, herbicide, weed contamination, biological efficiency, yield structure.

Abstract: Damage and disease damage to forests affects forest resources and the potential for wood use. Based on departmental data for 2012-2018, in which personal participation was taken, the foci of pine and larch sponges in the territory of Slyudyansky and Shelekhovsky forestries were characterized. The largest areas were pine sponge foci. In the Slyudyansk forestry, the focus of decay under the influence of natural factors in 2016 and no new outbreaks were found. At the end of 2018, the outbreak area in the Shelekhovsky Forestry amounted to 11.5 hectares. The larch sponge in the Slyudyansk forestry has a rather stable outbreak. In 2013, the outbreak had the largest area of 70 hectares and in 2017, 87.99 hectares. In 2014-2016, 2018, there was a significant decrease in the area of the sponge focus and at the end of 2018 amounted to 21.29 hectares. According to the degree of damage to the forest stand by a pine sponge, a weak degree of damage prevails in the Shelekhov forestry, medium and strong have approximately equal shares, solid - insignificant. In Slyudyansk forestry, the average degree of damage to the stand by a pine sponge prevails. In the foci of the larch sponge of Slyudyansk forestry, the areas of stands with weak and moderate damage were distributed almost equally - one third, strong - a little more. Almost three quarters of the area of the center of the larch sponge in the Shelekhov forestry is in a weak degree of damage, the rest is in the middle. If control measures are not applied in time, then under favorable conditions for diseases, this can lead to an increase in the area of foci.

Keywords: common pine, Siberian cedar pine, pine sponge, larch sponge, Southern Prebaikalia.

Abstract: The results of studies of the bird population on the territory of the interfluve of the left tributaries of the Ushakovka river - Khudyakova and Kukshi rivers are presented. The composition and density of the bird population were taken into account all seasonally in 2015–2019. The presence of 54 bird species from 9 orders was noted. By the nature of their stay, 9 nesting species (Passer montanus, Phoenicurus auroreus, Coccothraustes coccothraustes, Parus major, P. montanus, Lanius cristatus, Cyanopica cyana, Motacilla alba, Carpodacus erythrinus), 3 - passing ones (Grus grus, Ocyris pusillus, O. rusticus), 23 - vagrants, 7 - possibly nesting, but no nests and fledglings were found, but mating songs of males were recorded (Dendrocopos major, D. minor, Muscicapa sibirica, Ficedula albicilla, Phoenicurus phoenicurus, Phylloscopus fuscatus, Emberiza citrinella), 7 - wintering (Bombycilla garrulus, Aegithalos caudatus, Sitta europaea, Parus ater, P. palustris, Uragus sibiricus, Acanthis flammea), 5 - settled, but not nesting in the study area (Corvus corax, C. corone, Pica pica, Pyrrhula pyrrhula, Carduelis carduelis). The most common synanthropic species are: Corvus corone, Pica pica, Passer montanus, Parus major, Motacilla alba, Phoenicurus auroreus. The bird population density varies at different times of the year (from 0.1 to 59.0 individuals per 10 ha): it increases during autumn and spring migrations, as well as in the autumn-winter period due to bird species roaming from the northern territories. It is noted that 44.4% prefer to settle on trees and shrubs, 44.4% - on buildings, 11.2% - in hollows and birdhouses. Plants were studied, the seeds and fruits of which feed on birds. The basis of nutrition is cultivated fruit trees and shrubs, as well as the seeds of coniferous forest species, seeds and fruits of various weedy herbaceous plants.

Keywords: anthropogenic landscape, gardening, fodder plants, bird population, density, nature of stay and nesting

Abstract: The results of a dendroclimatic study of the annual rings of Scots pine (Pinus sylvestris L.), growing in the dry forest growing conditions of the ribbon pineries of the Irtysh region (Eastern region of Kazakhstan) are presented. The main causes of climatic dependence of the seasonal variability of the radial growth of pine trees are discussed. It has been established that the climatic temperature signal and, to the least extent, precipitation have the greatest influence on the width of the annual ring. In the conditions of the ribbon pineries of the Irtysh region, to a greater extent, the width of the annual ring is determined by the second half of the growing season (June-July). Hot June and July negatively affect the radial growth of Scots pine, and precipitation, on the contrary, contributes to the formation of wider annual rings. The main contribution to the variability of the width of the annual ring is precisely the air temperature. Over the past 50 years, there has been a decrease in the influence of May temperature on the radial growth of pine growing in dry forest growing conditions of the studied region, and an increase in the influence of July temperature. The revealed relationship between the June-July precipitation of the current year and the annual growth of pine under dry growing conditions is not stable over time. At the same time, the close relationship between the May rainfall and the radial growth of pine, which was observed in the middle of the last century (1952-1962), sharply decreases over the next 50 years. There is a general tendency to increase the influence of temperature (August-September) and precipitation (August) at the end of the growing season of the previous year over the past 15-20 years.

Keywords: pine stands, radial growth, climatic factors, dendroclimatology.

Abstract: Ecological features of the white bellied capercaillie Tetrao urogallus taczanowskii in the Omsk region are determined by the living conditi ons. In the period 1993 2018. with average annual abundance (N= 10.105 thousand individuals), the average population density is 3.19 individuals 10 km 2 . The increase in numbers occurs in two to four years. A direct relationship was established between it s number and Wolf numbers (W) (p <0.05) (r = 0.20); weak feedback with the period of water availability (r = 0.30) and water level (r = 0.24), which is associated with the state of the swamps. The start and end dates for the white bellied capercaillie in the Omsk Region are characterized by a weak feedback (r = 0.28, p <0.05): the earlier the current begins, the more time consuming it is. The beginning of the current flow is in inverse average relation with the average monthly temperature in March (r = 0.56, p <0.05) and April (r = 0.65,p <0.05): the higher the temperature, the earlier the current starts. The termination of currenting is in very weak feedback with the average monthly temperature of May (r = 0.04, p <0.05) and June (r = 0.01, p <0.05) 0.05): the end of the currenting is almost independent of temperature. With the lowest abundance of common capercaillie for each administrative region of the Omsk Region (N = 2.577 thousand individuals), the average population density is 0.79 individuals / 10 k m 2 ; at the highest abundance indices (N = 15.141 thousand individuals), the average population density is 4.66 individuals / 10 km 2 ; with average long term (1993 2018) abundance indicators(N = 10.105 thousand individuals), the average population density i s 3.19 individuals / 10 km 2 ,while with an estimated number (N = 12.242 thousand individuals), the average population density is 2 70 individuals / 10 km 2 . From 1995 1997 capercaillie in the Omsk region has the status of very rare hunting for him is pro hibited.

Keywords: capercaillie, abundance and distribution, biological calendar, Omsk

Abstract: Statistical processing of experimental data on water quality control in the city of Irkutsk and the districts of the Irkutsk region over the past three years was carried out. Monitoring the results of testing the quality of drinking water showed a satisfactory condition of the studied samples. The data obtained indicate that in 2018 the total number of samples increased by 10.1%, while the number of samples performed under the state order continues to decrease. There was a slight decrease in the number of non-standard samples in the total number from 1104 in 2017 to 1031 in 2018. The analysis of the chemical composition of water samples was carried out using modern physicochemical methods, for example, such as atomic absorption spectrometry using ICP-MS, high performance liquid chromatography with indirect UV detection of anions on a reversed modified phase column. The concentration of more than 30 ions and trace elements, as well as permanganate oxidizability, electrical conductivity and pH of the water was measured. From the data obtained it follows that water samples in the city of Irkutsk, Irkutsk and Olkhonsky districts do not meet hygienic standards for 26 indicators. It has been shown that centralized water supply does not comply with sanitary norms and rules, mainly in terms of organoleptic characteristics (turbidity and color) and iron content. Residual chlorine and chloroform do not meet hygienic standards mainly in pool water due to insufficient, or, conversely, excessive chlorination of water. The water of the reservoirs is most often non-standard in the content of COD, BOD, coloring and oil products.

Keywords: water, quality control, safety, research methods, chemical composition, quality indicators.

Abstract: In 2019, in the territory of the Ishimsky forest-steppe of the Nazyvaevsky and Tyukalinsky districts, 50 species of animals were found included in the Red Book of the Omsk Region (2015), which amounted to 25% of their list in the section ―Animals‖. In the Nazyvaevsky district, in 2 artificial reservoirs, the habitat of broad-toed river cancer was revealed. The absence of red-book representatives of the Round-banded and Bony fish classes, as well as the species of Amphibians included in the Red Book of the Omsk Region (2015), was established. Krutinsky, Tyukalinsky and Sargatsky districts are the southern edge of the range of the viper ordinary along the left bank of the Irtysh in the Omsk region. Information on penetration into the Omsk region from the west of the common copperfish has not been confirmed. Lake Mangut in the Nazyvaevsky District has become a permanent nesting place for curly pelicans and is the breeding ground of the Goose Goose and Red-breasted Pisculi. It is established that along the shores of Lake. Dubasnoe in the Krutinsky district, for at least 30 years, the osprey regularly nests. For the first time in the region, the nesting of Asdotka Asiatic was recorded on the territory of the Nazyvaevsky District near Lake Dry. The northern boundary of the distribution of jerboa large on the left bank of the Middle Irtysh River has been established, passing through Krutinsky, Tyukalinsky, Sargatsky and Bolsherechensky districts within 56–57° north latitude. Wolverine was found entering the territory of the Nazyvaevsky District, expanding the boundaries of migration of this predator in the Omsk Region. It is proposed to clarify the rarity status of whooper swan and large godworm.

Keywords: Red Book of Omsk region, Ishimsky forest-steppe, birds, mammals.

Abstract: Describe the structural features of the heart and its internal structures in the Far Eastern leopard, a rare representative of the fauna of the Russian Far East. The habitat of this wild cat is very limited: the main population is concentrated in the south of Primorsky Krai (Khasansky district) and in the border areas of the PRC and DPRK. Far Eastern leopard is the rarest feline. Due to the exceptional rarity of the species, it is not possible to study a group of organs similar in weight and age to animals using mathematical statistics. The heart obtained from opening an adult male who died as a result of a traffic accident in 2014 in the Khasansky district was investigated and described. The heart was appropriately isolated from the organ-complex heartlungs and pericardium, the chambers were opened in accordance with generally accepted methods. For measuring manipulations we used a flexible metal ruler and a vernier caliper with a measuring step of 0.05 cm. The morphometric parameters of the internal structures were determined. Studied and described the distinctive features of the structure of the structures of the heart. Structures of the valvular apparatus (fleshy and septomarginal trabeculae, papillary muscles, cusps and tendon strings of atrioventricular valves), structural features of the heart chambers (for example, scallop muscles of the atrial ears) are considered. The heart shape is ellipsoid, the cardiac index was 75%. The heart of a leopard is slender, with a pointed apex and a strong left ventricle. The scallop muscles of the right atrium lie more rarefied than similar formations of the left, they are longer and thinner. This feature is true for muscles of both the first and second orders. The papillary muscles of the right ventricle are cylindrical, conical and complex indefinite shape. The septal (main) muscles, of all the papillary muscles of the right ventricle, have the smallest size and diameter. The ears of the atria are small. The largest of them - the right one occupies a small space, approximately ¾ of the width of the corresponding ventricle.

Keywords: heart, morphometric parameters, internal structures, Far Eastern leopard.

Abstract: It is known that today the ―cross-section‖ of the hairline is one of the poorly studied pathologies of fur farming, which causes great economic damage in modern fur farming. In the scientific literature, fragmentary and fragmentary data on the hematological composition of the blood of clinically healthy standard dark brown minks are found, there is insufficient information on changes in the hematological parameters of blood during the ―section‖ of the mink hairline. The article presents the results of studies of the hematological blood picture of standard dark brown minks in the pathology of the ―section‖ of the hairline. The main clinical manifestation of the ―cross-section‖ in minks is the uneven, cottony appearance of the hairline, a decrease in the length of the outer and guide hairs, resembling ―cut‖ hair. On the sides, scruff, neck of the outer hair did not cover the underfur. The total area of lesions was 85-90%. The color of the hair was not changed, it is tightly held in the follicles on the affected areas of the hair. The studies revealed that minks with this pathology showed an increase in the level of leukocytes by 4.6x109/L or 44.6%, red blood cells by 2.31x1012/L or 25.9%, hemoglobin by 71 g/L or 40.5%. The leukocyte formula established: a shift of the nucleus ―to the right‖ (an increase in segmented neutrophils by 6.9×109/L or 64.2%), an increase in the level of lymphocytes by 3.226×109/L or by 90.6%. It is possible that these changes in the morphological composition of the blood of minks with pathology ―section‖ of the hairline occur with pathologies of the endocrine system, exposure to stress factors, chronic allergic reactions, pathologies from the liver and kidneys.

Keywords: mink, blood, hematological picture, ―section‖, hairline.