scholarly journals The degree of cumulation of the “Bendamin” drug in the body of white rats

2019 ◽  
Vol 21 (94) ◽  
pp. 82-85
Author(s):  
I. S. Varkholiak ◽  
B. V. Gutyj
Keyword(s):  
Total Bilirubin ◽  
White Blood Cells ◽  
Weight Ratio ◽  
The Body ◽  
Laboratory Animals ◽  
Control Group ◽  
Internal Organs ◽  
White Rats ◽  
Chronic Poisoning ◽  
Experimental Group

Repeated introduction into the body of an animal of a medicinal substance can lead to its accumulation in the tissues of the body. Therefore, knowledge of the cumulative properties of substances or conditions that may lead to cumulations, are especially important for understanding the pathogenesis of intoxication, because this phenomenon often lies at the basis of acute and chronic poisoning. The purpose of the work was to study the degree of cumulation of the “Bendamin” preparation in the body of white rats. The properties of the cumulative drug were studied in 12 white rats weighing 150–160 g. Rats were divided into 2 groups: control and experimental. To determine the cumulative properties of Bendamin, it was administered to laboratory animals starting at a dose of 0.1 DL50, with a sequential increase in the dose of 1.5 times every 4 days. It was found that the cumulative coefficient of Bendamin was 8.31 units, indicating that the drug does not exhibit cumulative effects. In determining the mass coefficients of the internal organs in the animals of the experimental group, the tendency to increase the weight and liver mass coefficients was determined, respectively, by 5.2 and 5.1%. The weight ratio of the heart of the animals of the experimental group increased by 5.7% relative to the control group. After studying the morphological parameters of blood of rats at 24 days of the experiment for studying the cumulative properties of the “Bendamin” drug, an increase in the number of erythrocytes to 6.13 ± 0.27 T/L, white blood cells to 8.42 ± 0.54 G/L and hemoglobin up to 132.4 ± 2.44 g/l. In the analysis of leukocyte profile in rats, there was a decrease in the number of eosinophils and monocytes, respectively, at 1.1 and 1.3% relative to the control group. The number of lymphocytes in the blood of the experimental group of rats increased by 1.5%, while neutrophils by 0.9% compared to the control. When studying the level of total protein, its small increase was determined by 5.2%. The activity of aminotransferases in the blood serum of experimental rats on the 24th day of the experiment for the study of cumulative properties of the drug also increased by 13 and 8% relative to the control group. Also, creatinine and total bilirubin levels in their rat blood were decreased by 3.1 and 8.8%, respectively.

Influence of DAFS-25+polizon composition on blood and functional state of liver of steers at fattening

2020 ◽  
pp. 15-18
Author(s):  
Inna R. Kilmetova ◽  
◽  
Igor A. Rodin ◽  
Nazira I. Khayrullina ◽  
Nikolay G. Fenchenko ◽  
...  
Keyword(s):  
Functional State ◽  
White Blood Cells ◽  
Live Weight ◽  
The Body ◽  
Farm Animals ◽  
Control Group ◽  
Standard Diet ◽  
The Impact ◽  
Experimental Group ◽  
Stimulation Of

Summary. The disbalanced feeding and the uneven distribution of micro- and macroelements in the environment leads to a trace element, in particular hypomelanosis. To accelerate the growth and preservation of young farm animals include in the diet of various biological additives and drugs, which include selenium. For stimulation of weight gain in the livestock industry, as well as for the prevention and treatment of pathological processes in addition to micro - and macrouse amino acids, primarily methionine. The aim of this work was to study the influence of composition of DAFS-25+Polizon on morpho-biochemical parameters of blood and functional state of the liver in fattening bulls of black-motley breed in the conditions of the Republic of Bashkortostan. Experiments using were conducted on bull-calves of black-motley breed of the properties in the properties age from 6 to 15 months. The first experimental group during the experiment was additionally given the composition of DAFS-25+Polizon at a dose of 2 mg/kg, the animals of the control group received a standard diet. To assess the impact of the composition DAFS-25+Polizon on metabolism cattle studied morphological and biochemical indicators of blood and conducted histological examination of the liver. It is established that the use of the composition of DAFS-25+Polizon at a dose of 2 mg/kg increases the number of erythrocytes and hemoglobin in the experimental group and reduces the amount of white blood cells. The serum content of total protein, phosphorus and calcium increases in the group of experimental animals. Microscopic examination of the liver revealed no changes in the structure of the organ and hepatocytes in the experimental group, whereas in the control group hemodynamic disorders and dystrophic changes in liver cells were observed. Thus, the use of the composition DAFS-25+Polizon at a dose of 2 mg/kg of live weight in fattening bulls black-and-white breed contributes to the increase of redox processes in the body, stimulation of metabolism, prevent the development of liver disorders of cellular mechanisms of metabolism, optimizes the structure of the liver, which generally provides higher productivity.

The effectiveness of use of enterosorbent Shelltic Es when rearing of young pigs

2020 ◽  
pp. 3-11
Author(s):  
S. Grikshas ◽  
N. Kulmakova ◽  
K. Spitsyna ◽  
A. Dar’in ◽  
T. Mittelshtein
Keyword(s):  
Average Daily Gain ◽  
Live Weight ◽  
Feed Additives ◽  
The Body ◽  
Control Group ◽  
Internal Organs ◽  
Feed Digestibility ◽  
Young Pigs ◽  
Carcinogenic Effects ◽  
Experimental Group

Mycotoxins have been formed in feed are secondary metabolites of fungi and are quite stable substances that have teratogenic, mutagenic and carcinogenic effects. An effective way to combat mycotoxins in feed is the use of feed additives that adsorb toxins, prevent their absorption in the gastrointestinal tract of the animal and are excreted from the body. The infl uence of coconut enterosorbent Shelltic Es on fattening and meat qualities of young pigs has been studied. It has been found in the process of fattening that the highest feed digestibility was in pigs of the experimental group, in the diet of which enterosorbent has been added. The results of studies of the chemical composition and technological properties of pork have been provided. The positive eff ect of enterosorbent on precocity, absolute average daily gain of live weight and reduction of feed expenditures per 1 kg of gain has been revealed. In pigs from the experimental group the average thickness of the fat was higher and the area of the “muscle eye” was lower compared with animals of the control group, which indicates that higher rates of carcass yield have been obtained due to faster accumulation of fat tissue. The weight of internal organs of pigs indicates the intensity of metabolic processes in the body. In experimental animals the weight of the lungs was 0,1 kg lower, and the liver and heart were higher by 0,13 and 0,01 kg, respectively. Enterosorbent had no effect on the content of vitamins in the liver of pigs of the compared groups. The content of impurities of organochlorine toxicants and toxic elements in the meat and liver of animals of the experimental group was lower than that of control analogues. Therefore, the use of enterosorbent Shelltic Es promotes more active excretion of them from the body.

scholarly journals Експериментальне зараження поросят вірусом епідемічної діареї свиней

2017 ◽  
Vol 19 (77) ◽  
pp. 208-213
Author(s):  
D. Masiuk ◽  
A. Sosnitskiy ◽  
A. Kokarev ◽  
S. Koliada
Keyword(s):  
Real Time ◽  
The Body ◽  
Control Group ◽  
Rt Pcr ◽  
Internal Organs ◽  
Real Time System ◽  
E Coli ◽  
Neonatal Piglets ◽  
And Control ◽  
Experimental Group

There were infected neonatal piglets in the first days of their lives PED virus suspension derived from pigs previously PED patients. Diagnosis for PED in piglets donor virus PED was inserted complex method for clinical and epizootic performance and confirmed the identification PEDV by PCR-RT using the test system «EZ-RED/TGE/PDCoV MPX 1.0 Real time RT-PCR» company Tetracore (USA) Thermocyclers CFX 96 Real-Time System company BIO RAD (USA). Homogenate small intestine of pigs PEDV donor, prepared in a blender for PCR in a thick band of 18 animal carcasses, frozen at -18 °C without cryopreservation and kept 359 days. Before infecting pigs and strip defrost by RT-PCR identified the concentration of the virus genome equivalents (GE) without establishing viable virions quantitative pathogen. For Sample 20 selected analog neonatal piglets, divided them into 3 experimental groups (group 1 – 5 piglets, group 2 – 5 piglets and group 3 – 7 piglets) and one control (3 piglets). Research pigs infected per os virus-containing suspension with a concentration PEDV 1.03×106 GE/cm3. The dose for infection first group was 6 cm3 (6.18×106 GE/cm3), for the second – 5 cm3 (5,15 × 106 GE/cm3), for the third – 4 cm3 (4.12 GE×106/cm3) homogenate. The fourth group – control (not infected). All the pigs were in identical conditions that fully meet the physiological needs of the body. Of the 17 infected pigs only 2 was infected PEDV. PED was confirmed by laboratory methods. In bacteriological examination of internal organs of pigs that came out of a research experiment and control group were diagnosed colibacteriosis. In the control group was isolated from heart and intestinal non-pathogenic for white mice E. coli. From pigs 1 and 2 research groups has been allocated to white mice nonpathogenic E. coli, is set colibacteriosis; 2 experimental group found in one pig hemolytic E. coli; 3 experimental group from the internal organs of pigs in conjunction with non-pathogenic for mice intestinal former cane isolated Klesiella spp., is diagnosed with mixed infection (E. coli, Klesiella spp.). From the intestine of experimental and control pigs do not identified beneficial microflora – aerococcus, lactobacteria, bifidobacteria and cultured putrefactive anaerobic spore facultative and non spore microflora.

COMPARATIVE ASSESSMENT OF THE FUNCTIONAL PROPERTIES OF THE FOOD ADDITIVE «TOMATNAYA» OBTAINED BY VARIOUS TECHNOLOGIES

2021 ◽  
Author(s):  
Е.П. ВИКТОРОВА ◽  
Е.В. ЛИСОВАЯ ◽  
М.В. ЛУКЬЯНЕНКО ◽  
Н.Н. КОРНЕН ◽  
Е.В. КУЗЬМИНОВА ◽  
...  
Keyword(s):  
Functional Properties ◽  
Antioxidant Properties ◽  
Food Additive ◽  
The Body ◽  
Innovative Technology ◽  
Control Group ◽  
Standard Diet ◽  
Tomato Pomace ◽  
White Rats ◽  
Experimental Group

Для получения препаратов и добавок, обладающих антиоксидантными свойствами, представляют интерес выжимки томатов, образующиеся при производстве сока прямого отжима с предварительным отделением семян. Проведена сравнительная оценка эффективности функциональных свойств образцов пищевой добавки, полученных из выжимок томатов по различным технологиям: образец добавки 1 получен по технологии, включающей ИК-сушку выжимок, их охлаждение и измельчение; образец добавки 2 – по инновационной технологии, включающей дополнительную предварительную обработку выжимок в ЭМП СВЧ перед ИК-сушкой. Исследования проводили в течение 30 дней на трех группах лабораторных белых крыс: контрольной, животные которой получали стандартный рацион, и двух опытных, в которых животные помимо основного рациона получали при кормлении индивидуально 1 раз в сутки 2 г добавки образца 1 (1-я опытная группа) или образца 2 (2-я опытная группа). Установлено, что степень снижения концентрации ферментов печени АсАт и АлАт в крови животных 2-й опытной группы соответственно на 10,6 и 11,0% выше, чем в крови животных 1-й опытной группы. Степень снижения содержания диеновых коньюгатов, кетодиенов и малонового диальдегида в крови животных 2-й опытной группы была соответственно на 22,1; 10,1 и 12,7% выше по сравнению с аналогичными показателями животных 1-й опытной группы. Таким образом, доказано, что пищевая добавка «Томатная», выработанная по инновационной технологии, проявляет ярко выраженные антиоксидантные и гепатопротекторные свойства, что обеспечивает нормализацию биохимических процессов в организме, повышает его антиоксидантную защиту и препятствует разрушению мембран клеток. For the obtaining of preparations and additives with antioxidant properties, tomato pomace, formed during the production of direct-pressed juice with preliminary separation of seeds, is of interest. A comparative evaluation of the effectiveness of the functional properties of food additive samples obtained from tomato pomace using various technologies was carried out. The sample of additive 1 was obtained using a technology that includes IR drying of pomace, cooling and grinding; the sample of additive 2 was obtained using a technology that includes additional pretreatment of pomace in microwave EMF before IR drying. The studies were carried out for 30 days on three groups of laboratory white rats: a control group, the animals of which were given a standard diet, and two experimental ones, in which the animals, in addition to the main diet, were given individually once a day with 2 g of an additive of sample 1 (1st experimental group) or sample 2 (2nd experimental group). It was found that the degree of decrease in the concentration of liver enzymes AsAt and AlAt in the blood of animals of the 2nd experimental group was respectively 10,6 and 11,0% higher, than in the blood of animals of the 1st experimental group. The degree of decrease in the content of diene conjugates, ketodienes and malondialdehyde in the blood of animals of the 2nd experimental group was higher respectively by 22,1; 10,1 and 12,7% compared with similar indicators of animals of the 1st experimental group. Thus, it is proved that the food additive «Tomatnaya», developed by innovative technology, shows pronounced antioxidant and hepatoprotective properties, which ensures the normalization of biochemical processes in the body, increases its antioxidant protection and prevents the destruction of cell membranes.

scholarly journals An Experimental Model of Liver Cirrhosis in Laboratory Animals

2019 ◽  
pp. 72-77
Author(s):  
D. A. Yevseyenko ◽  
Z. A. Dundarov ◽  
E. A. Nadyrov
Keyword(s):  
Body Weight ◽  
Liver Cirrhosis ◽  
Olive Oil ◽  
The Body ◽  
Blood Analysis ◽  
Male Rats ◽  
Laboratory Animals ◽  
Control Group ◽  
Experimental Group ◽  
Biochemical Blood Analysis

Objective: to develop and justify the application of a new experimental method of the simulation of liver cirrhosis in laboratory animals. Material and methods. The simulation of liver cirrhosis was performed on 11 eugamic white Wistar male rats with the body weight of 203.5 ± 22.2 g (experimental group). The control group consisted of 12 healthy laboratory animals. Acute toxic liver injury resulting in cirrhosis was caused by means of the intraperitoneal administration of 50 % solution of carbon tetrachloride (CCl4) in olive oil on the first day of the experiment at a dosage of 0.1 ml of CCl4 + 0.4 ml of olive oil per 100 g of the body weight of the animals, on the second day of the experiment - 0.3 ml of CCl4 + 0.2 ml of olive oil per 100 g of the body weight of the animals. For synergism and potentiation of the hepatotoxic effect of CCl4, the animals daily had free access to 10% ethanol solution. The duration of the experiment was 65 days. The clinical and laboratory parameters were evaluated, the histological assessment of the preparations was carried out. The obtained data were compared with the same parameters of the control group of the animals. Results. The reproducibility of the model was 81.8% (9 animals). The values of the biochemical blood analysis indicated statistically significant increases in the levels of total bilirubin, serum transaminases (AST, ALT), creatinine, a decrease in the glucose level in the animals of the experimental group. The complex morphological confirmation of liver cirrhosis in progress was obtained. Conclusion. The proposed method of the liver cirrhosis modeling correlate with the values of the biochemical blood analysis, pathological changes in the tissue of the liver and internal organs of liver cirrhosis in humans. With the help of the original model, it is possible to investigate the pathogenesis and effects of various groups of pharmacological drugs on liver cirrhosis and its complications (acute blood loss associated with the syndrome of portal hypertension).

PREVENTION AND CORRECTION OF DISORDERS OF THE METABOLISM OF PIGS WITH THE USE OF NATURAL FEED ADDITIVES

2021 ◽  
Vol 1 (2) ◽  
pp. 189-194
Author(s):  
L.A. Nikanova ◽  
◽  
E.N. Kolodina ◽  
R.A. Rykov ◽  
◽  
...  
Keyword(s):  
Blood Serum ◽  
Total Bilirubin ◽  
Live Weight ◽  
Feed Additives ◽  
The Body ◽  
Control Group ◽  
Blue Green Algae ◽  
Adaptive Ability ◽  
Positive Effect ◽  
Experimental Group

This article presents the results of studies conducted on piglets with the inclusion of natural feed additives in the diet in order to prevent and correct metabolism. The first experimental group of piglets received a total diet consisting of fullfledged compound feed, a complex micro-feed product consisting of blue-green algae Spirulina, dihydroquercetin and organic iodine, the second experimental group additionally received Spirulina and dihydroquercetin. The introduction of these natural feed additives into the diet of piglets helped to increase the adaptive ability , correction and prevention of metabolic disorders in the body. In these studies, dacha feed supplements prevented hyperbilirubinemia. As a result, the concentration of total bilirubin in the blood serum of pigs of the first experimental group was 1% lower, in the second experimental group it was 13,7% lower than in the control group. They also had a positive effect on the functional state of the liver, as evidenced by a lower content of AlAT and AsAT activity in the blood serum compared to those in piglets of the control group with a close cholesterol-forming fraction. The animals of the experimental group were less ill and the safety of this group was 100%, in the control group it was 90%. The average daily increase in live weight of pigs for 90 days in the first experimental group was 1% higher than in the control group, and in the second experimental group it was 21,7% higher.

Haemostatic Shifts in Rats at Combined Hyper- and Hypothermic Exposure and Their Correction with Vitamins A, E, B6, B9, B12, P

2020 ◽  
pp. 394-400
Author(s):  
Anton V. Samoylov ◽  
◽  
Tat’yana Yu. Astakhova ◽  
Vladimir G. Solov’ev ◽  
◽  
...  
Keyword(s):  
Coagulation Factors ◽  
The Body ◽  
Laboratory Animals ◽  
Control Group ◽  
Thrombin Time ◽  
White Rats ◽  
Test Parameters ◽  
Significant Acceleration ◽  
Coagulation Testing ◽  
Therapeutic Doses

This study aimed to assess the state of haemostasis at supplementation of the diet with vitamins and the possibility of correcting changes in coagulation under combined thermal effects on the body of laboratory animals (white rats). The animals were kept on a nutritious diet with sufficient intake of proteins, fats, carbohydrates and trace elements. As part of daily servings in addition to the diet, the experimental group received vitamins A, E, B6, B9, B12 and P in therapeutic doses adequate to those recommended for humans; the control group did not receive vitamins. After 14 days, part of the animals from both groups were subjected to combined thermal stress. At all painful manipulations the animals were anesthetized with ethoxyethane. Blood samples were taken in a syringe from the jugular vein exposed by an ovalshaped incision immediately after stress exposure. For coagulation testing, blood was stabilized with a 3.8 % sodium citrate solution in a ratio of 1 to 9. Subsequent blood treatment met the requirements accepted for coagulation testing. The following haemostatic parameters were studied: platelet count, activated partial thromboplastin time, prothrombin time, thrombin time, antithrombin III activity, as well as content of fibrinogen and soluble fibrin monomer complexes. The obtained results showed that the combined thermal effect causes a significant acceleration of continuous blood coagulation (consumption thrombocytopenia, hypofibrinogenaemia and mismatch of clotting test parameters) in rats. Additional vitaminization restrains the severity of these changes, which is manifested in the absence of platelet consumption, a decrease in the consumption of plasma coagulation factors and the preservation of a high antithrombin potential.

scholarly journals Effects of armadin on hepatic transaminases in rats with acute generalized peritonitis on the background of diabetes mellitus

2021 ◽  
Vol 11 (5) ◽  
pp. 333-338
Author(s):  
M. Regeda ◽  
B. Verveha ◽  
N. Melnyk
Keyword(s):  
Diabetes Mellitus ◽  
Abdominal Cavity ◽  
White Male ◽  
The Body ◽  
Laboratory Animals ◽  
Control Group ◽  
Male Adult ◽  
Generalized Peritonitis ◽  
Streptozotocin Induced Diabetes ◽  
Experimental Group

The article discusses the issues about the effect of the Armadin on the hepatic transaminase in rats with acute generalized peritonitis on the background of diabetes mellitus. The experiment was performed on 48 white male adult rats, which were divided into two groups. The experimental group – animals with simulated acute generalized peritonitis against the background of streptozotocin-induced diabetes with the drug “Armadin” (ethylmethylhydroxypyridine succinate) application (n=24). The control group – animals with simulated acute generalized peritonitis against the background of streptozotocin-induced diabetes without pharmacocorrection (n = 24). Diabetes mellitus was simulated by a single intraperitoneal injection of streptozotocin at the dose of 60 mg/kg. Acute generalized peritonitis was induced with 10% faecal suspension in a dose of 0.5 ml per 100 g of animal weight in the abdominal cavity of laboratory animals by puncture method. Every day for 6 days, rats of experimental group received the drug “Armadin” at the doses of 100 mg/kg. We found a probable decrease in aminotransferase activity on day 3 of the study in rats of the experimental group after administration of Armadin. Thus, ALT activity decreased by 26.7%, and AST activity – by 25.9% compared to the control group. On the 7th day of the study, the activity of ALT in the blood of rats of the experimental group decreased to 0.50 ± 0.03 mmol/l, which was 49.5% lower than the control group of rats in this period of the experiment. Similar changes are observed in the study of AST activity, where, accordingly, it decreased by 48 % relative to control. The positive effect of the drug "Armadin" on the body of rats, with AGP on the background of STZ-induced diabetes, is manifested by the restoration of the functional state of the liver.

scholarly journals The effect of the developed composition of lactic acid bacteria isolated from Carpathian cheese, on the body of laboratory animals

2021 ◽  
Vol 23 (94) ◽  
pp. 9-15
Author(s):  
I. I. Kushnir ◽  
O. Y. Tsisaryk
Keyword(s):  
Lactic Acid ◽  
Lactic Acid Bacteria ◽  
Average Concentration ◽  
The Body ◽  
Laboratory Animals ◽  
Control Group ◽  
Morphological Parameters ◽  
White Rats ◽  
Probiotic Strains ◽  
Positive Effect

Data on the study of the effect of a consortium of lactic acid bacteria on the morphological parameters of blood and the state of the intestinal microflora of white rats using a composition of probiotic strains of L. lactis, Lb. plantarum and E. durans SB18 in a ratio of 50:40:10. Thus, when determining the morphological parameters of the blood of rats at 14 days of use found a positive effect of probiotic strains of lactic acid bacteria on the hematopoietic function of laboratory animals. In particular, a significant increase in hemoglobin concentration, erythrocyte count, leukocyte count and hematocrit value was found by 14.9, 14.0, 22.5 % (P < 0.05) and 5.7 %, respectively, compared with the control group. In addition, the use of the drug for 14 days caused an increase in the average concentration of hemoglobin in the erythrocyte (MCНS) by 9.8 % (P < 0.05) and a tendency to decrease the average hemoglobin in the erythrocyte (MCН) and the average erythrocyte volume (MCV) by 0.45 and 9.0 %, respectively, compared with the control group. Both central and peripheral organs of the immune system were also significantly affected. In particular, the relative weights of the thymus and spleen increased by 21.1 (P < 0.05 ) and 9.8 % (P < 0.05), respectively. When determining the leukogram of peripheral blood of rats, it was found that the use of the study drug in animals of the experimental group caused a tendency to increase the number of neutrophils, lymphocytes and monocytes by 6.0, 0.5 and 19.8 %, respectively, with a slight decrease in eosinophils. The use of a composition of a consortium of lactic acid bacteria stimulated an increase in lacto- and bifidobacteria content of the large intestine of white rats. In particular, a significant increase in the number of bifidobacteria and lactobacilli was found by 4.3 and 5.2 % (P < 0.001), respectively, relative to the animals of the control group. In addition, 14-day application of the studied composition of probiotic strains contributed to a probable reduction in the number of opportunistic and putrefactive microflora. The number of Escherichia coli, Staphylococcus aureus and fungi of the genus Candida significantly decreased relative to control by 4.7 (P < 0.01), 2.6 (P < 0.05) and 13.3 % (P < 0.001), respectively, all this indicated the recovery of the body of laboratory animals. The positive effect of lactic acid bacteria of the formed composition persists until the 21st day of the experiment.

scholarly journals The dioxin regulation criteria in the agro-industrial complex of Russia

2020 ◽  
Vol 17 ◽  
pp. 00224
Author(s):  
Radik Gibadullin ◽  
Alsu Gubeidullina ◽  
Vasilii Vinogradov ◽  
Sergei Glushko ◽  
Guzel Petrova
Keyword(s):  
Clinical Signs ◽  
Liver Mitochondria ◽  
The Body ◽  
Laboratory Animals ◽  
Ultrastructural Changes ◽  
Industrial Complex ◽  
White Rats ◽  
Chronic Poisoning ◽  
Mass Coefficient ◽  
Threshold Doses

The article studies the reactions of biochemical, hematological, pathomorphological, immunological and ultrastructural changes in the organisms of laboratory animals that were subjected to chronic dioxin poisoning at threshold doses were studied. There were hold toxicological experiments on white rats of both sexes weighing 155–215 g in order to detect threshold doses. For two months, 2,3,7,8-tetrachlorodibenzo-para-dioxin (2,3,7,8- TCDD) in amounts corresponding to 1/100 and 1/200 LD 50. After each decade, some of the animals were euthanized and weighed to calculate the mass coefficient of internal organs. The obtained data comparison revealed no statistically significant changes in organ. Continued observation of animals in the experiment for up to two months, characteristic intoxication 2,3,7,8-TCDD clinical signs did not give. The correlation dependence of the minimum effective doses of 2,3,7,8-TCDD, namely 1/400 of LD50 with LD50, was determined. The obtained threshold dose of dioxin can be recommended as the basis for the normalization of dioxin in the Russian agro-industrial complex. There were determined biochemical, hematological and ultrastructural changes in the body of animals exposed to chronic poisoning of 2,3,7,8-TCDD in doses of 1/200, 1/300 of LD50. The article describes a statistically significant dependence of the respiratory activity of the liver mitochondria in laboratory animals (white rats and rabbits) on chronic poisoning with threshold doses of various degrees. Based on laboratory animals’ experiments, threshold concentrations are determined and the maximum permissible levels of dioxin in the feed of some animals are tentatively calculated.

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