The article presents the results of the study of the influence of nanoacquahelats of biogenic and biocidal metals Selenium and Zinc together with vitamin E, on the mineral metabolism indexes of hens of Loman Brown breed. It is known that the inflow of mineral elements such as Calcium and inorganic Phosphorus into the body and its proper usage is essential for the maintenance of egg productivity and egg quality. In this regard, it is promising to study the changes of the above-mentioned processes with the Selenium, Zinc and vitamin E nanoacqualates supplementation. It has been established that the feeding of Selenium and Zinc nanocarboxylic acids with vitamin E positively affects the exchange of Calcium and inorganic Phosphorus in the laying hens. In particular, the content of calcium in the serum of tested hens was significantly higher (17.3-26.7%), on the 60th and 90th days of the experiment, comparing with the control group. The level of inorganic phosphorus, on the 60th and 90th days of the experiment, also increased by 17.7% and 16.9%, respectively, in experimental group of layer hens compared to control one. It is known that macroelements Ca and inorganic Phosphorus are important components for the organism of animals and, especially, birds. These minerals have no nutritional value, are not used by the body as a source of energy, but their role as structural elements cannot be overestimated. Both Calcium and inorganic Phosphorus are part of almost all organs and tissues. The growth and development of the organism, as well as its productivity depends on the presence of these elements in the diet. In addition, Calcium and inorganic Phosphorus are actively involved in the regulation of a number of vital functions. In the birds, it is the synthesis of proteins and the intense formation of egg minerals. They are also necessary for the further formation of bone tissue of the embryo. Consequently, the presence of these minerals in the diet and in the body of layers hens, to a large extent determine their weight and quality of eggs. The obtained results show the use of nanoacquahelats of Selenium and Zinc together with vitamin E stimulate phosphorus-calcium metabolism and alkaline phosphatase activity due to their biophysical properties which are based on activation of many biochemical processes according to the effect of Borisevich-Kaplunenko-Kosinov. Key words: Calcium, Phosphorus, laying hens, Selenium, Zinc, vitamin E.

The article presents data from the scientific literature describing the influence of stress factors on pigs in modern production conditions. It was established that stress factors that affect sows during gestation period affect fetal development and are important determinants of behavioral disorders in piglets in the future. Conditions for keeping and feeding pregnant sows play an important role in ensuring the behavior of future offspring. Stress of sows in the late stages of gestation can cause a negative longterm effect on the functioning of the immune system of piglets. This reduces the ability of piglets to be effectively protected against infections during lactation and weaning periods. Changes in the endocrine and neurotransmitter systems depend on the gestational period, with late pregnancy being the most sensitive phase in pigs. Ensuring optimal housing conditions for sows and newborn piglets is an important condition for the proper development of protective, feeding and behavioral reflexes and, accordingly, the realization of their productive qualities. Stress factors also affect pigs in the postnatal period of their development. The main stress-inducing factors are the conditions of feeding, maintenance and technological methods associated with ensuring veterinary wellbeing. Early social isolation during the early postnatal life of animals causes persistent changes in their behavioral responses and physiological mechanisms of adaptation. Raising pigs in a depleted environment may indicate the presence of chronic stress and, accordingly, a decrease in the level of welfare, protective and productive qualities in animals. The methods that can reduce stress and improve animal welfare is environmental enrichment and adaptation of the housing environment according to the behavioral needs of animals. Ecological enrichment can be used to preserve or restore physiological homeostasis and behavioral disorders in the post-stress period. Key words: stress, pigs, adaptation, behavior, immune system, productivity.

In recent decades, the intensity of the use of pigs has increased significantly. In such conditions, the body of animals is used almost to the limit of its capabilities. In this regard, the administration of many physiological functions is disrupted, the morbidity and decrease in the performance of pigs significantly increase. The increase in the level of drug use does not solve these issues. For example, the uncontrolled use of antibiotics can lead to even more significant problems - the development of antibiotic resistance. Despite this, in modern pig breeding, considerable attention is paid to the development and implementation of methods for the prevention of diseases in pigs. An important component of such activities is to ensure optimal conditions for the comfort and well-being of animals. This, in turn, implies a reduction in the negative impact of stress factors in raising and fattening pigs. The aim of our research was to get acquainted with modern literature data on the features of the influence of stressors on productivity and physiological functions of pigs. During the writing of this review article, we reviewed data from current research on the effects of stressors on the productivity and physiological functions of pigs in rearing and fattening. For this purpose, the funds of the scientific library of Bila Tserkva National Agrarian University, scientific research systems Science-Direct and PubMed were used. An important task of veterinary service of modern pig breeding complexes is to ensure optimal parameters of the microclimate, feeding quality feed, reducing the negative impact of stress factors. Ensuring proper housing conditions contributes to the improvement of qualitative and quantitative indicators of pig productivity (at slaughter, during slaughter, etc.). In this regard, we believe that a promising area of research is to study the effects of certain stressors and their combinations on the body of pigs and find methods to correct them.

Taking into account the peculiarities of the behavior of cows, in particular in the conditions of modern intensive animal husbandry, is an important factor in ensuring the health of the herd and obtaining high-quality livestock products. Behavioral indicators can be effectively used to monitor animal feeding and housing conditions. The aim of the work was to get acquainted with the stereotype of behavior of cows in industrial conditions under different physiological conditions and methods of keeping. For this, a search, selection and analysis of publications was carried out according to the topic of the study. Web of Science Core Collection and PubMed scientometric databases were used to search for scientific articles. It has been established that in the conditions of modern dairy farms, cows should be in a lying position for about half of the daily time. The soft and dry surface of the couches, their sufficient spatial parameters, ensuring adequate conditions of the external environment (temperature, humidity, wind speed, lighting, etc.) The quality of rest also depends on the social environment, physiological state, individual characteristics of cows, etc. Providing free access to walking areas and pastures contributes to a more complete expression of the natural behavior of dairy cows. Cows prefer to stay outside the premises mainly at night. Open pastures are more attractive to cows than walking areas with sand or straw. Foraging behavior is an important factor in ensuring cow health and high milk productivity. It is determined by the parameters of cows' access to fodder and the fodder table, the quality, quantity and feeding algorithm of fodder mass. Feeding of cows should be organized in such a way as to ensure constant free access of animals to the feed table, constant satisfactory, without physical obstacles, availability of quality feed on the feed table. Maternal behavior of cows is an important indicator that allows you to assess the condition and conditions of keeping cows before, during and after calving. Therefore, changes in the behavior of cows can have important diagnostic and prognostic value. Conducting further research in this direction is an urgent task of veterinary science and practice. Key words: stereotypeof behavior, cows, methods of maintenance, calves, exercise, diet, dairy farms.

The results of the study of the influence of selenium, zinc and vitamin E aqua chelates on lipid and carbohydrate metabolism in laying hens are reflected in the article. In the studies carried out on the layers of the breed, Lohman Brown examined the effect of the addition of selenium nanochemistry solutions at a dose of 30 ml / kg, zinc 30 ml / kg, along with vitamin E - 40 mg / kg of feed. The experiment lasted for 90 days, the use of the above-mentioned drugs caused changes in the content of the studied parameters, namely: a significant increase in the content of total serum lipids on the 60th and 90th day of the experiment in the experimental groups by 15.8-25.0% , and the level of triacylglycerol decreased in experimental layers by 12.8-13.3%. The study of cholesterol levels during the experiment revealed only a tendency to decrease within 4,7-6,1%. The concentration of glucose in the blood of the experimental layers during the experiment was significantly higher in the experiment by 7.2-8.4% compared to the control group of the layers.