The paper considers the biological effect of probiotic, enzyme and antibiotic agents on metabolism, efficiency and the element status of chickens. Joint inclusion of soybean-bifidum (0.7 ml/kg of feed), Tselloviridin G20x and Biovit-80 resulted in the increase of the egg weight by 9.8 and 9.0%, respectively in comparison with other groups. The group receiving Sporobacterin (10 ml/kg of feed) with feed was characterized by high fat availability (68%). The greatest conversion of feed gross energy was observed in groups in case of joint inclusion of Tselloviridin with probiotic and antibiotic agents (2.8 and 3.0%) and crude protein (6.2 and 7.0%). The spectral microelement analysis showed that the additional inclusion of biologically active agents caused their redistribution towards the increase of the need for main micronutrients for metabolism. All groups were characterized by a reliable increase of essential and conditional-essential elements such as Ca, K, Mg, Na, P, Cr, Cu, Fe, I, With, Mn, Se, Zn against the background of decrease such toxic elements as As, Al, Ag, Sr, Pb, Cd. The received results confirm the modeling role of probiotics, enzymes and antibiotics in the exchange of micro- and macronutrients.

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The high demand for quality and nutritious foods is constantly growing. To provide the population with high-quality meat products, it is necessary to determine the impact of the components introduced into the feed ration, which have a negative and positive impact on the production of these products, and then develop and apply tools to improve their quality. The oil and fat industry is a potential source of production of high-quality feed products for various types of animal husbandry, since the composition of oil-containing raw materials contains all the necessary components for animal nutrition. The main objective of our study was to assess and predict the quality and safety of the use of vegetable fats (palm, sunflower, soybean, rapeseed and flaxseed oils) in the production of beef meat. It has been found that the additional inclusion of vegetable fats enhances the intensity of metabolic processes in the body and thereby contributes to an increase in meat productivity.

Animal nutrition is an important aspect in optimizing the production process of meat and dairy farming. In the process of feeding animals, various digestive enzymes are released, which contribute to the proper functioning of the animal’s body. Biochemical blood indicators can be an indicator of health. They can characterize the level of animals’ adaptation to various stressful factors including the specific conditions of animal feeding. Research results show that a high correlation between the digestive enzymes of the pancreas and biochemical parameters of calves’ blood was shown with regards to the time factor and fat component when they were injected with vegetable fats. The dependent relationship in the experimental groups was as follows: sunflower oil (+) uric and acid lipase (r=0.57), total bilirubin and protease (r=0.51), glucose and lipase (r=0.68), protease and total protein (r=0.59), protease and albumin (r=0.51), protease and total bilirubin (r=0.63), protease–phosphorus (r=–0.55), respectively. (–) AST amylase (r=–0.54), ALT lipase (r=–0.52), amylase and total bilirubin (r=–0.68), amylase and iron (r=–0.62). Palm oil (+) total protein and lipase (r=0.58), glucose and protease (r=0.51), AST protease (r=0.54), iron amylase (r=0.57), calcium and lipase (r=0.63), negative gamma–GT and lipase (r=–0.53). Soybean oil (+) protease and creatinine (r=0.50). (–) urea lipase (r=–0.52), LDH protease (r=–0.75), iron and protease (r=–0.58), amylase–iron (r=–0.65) amylase–g–GT (r=–0.64), amylase–ALT (r=0.62). Flaxseed oil (+) albumin protease (r=0.53), ALT amylase (r=0.627), ALT protease (r=0.56), AST lipase (r=0.52), cholesterol amylase (r=0.55), phosphorus lipase (r=0.523). (–) gamma–GT protease (r=–0.54), glucose amylase (r=–0.63), glucose protease (r=–0.52). Thus, a pronounced positive relationship was observed over a period of time in sunflower (30–60 minutes), palm (60–90 minutes) and linseed (0–30 minutes) oils. Negative effects can be seen when using a diet supplemented with soybean oil. The developed mathematical models make it possible to predict the secretory function of the pancreas and the body’s response to various types of fats, with a database of biochemical parameters and the enzymatic activity of the pancreas.