Eletska T. Regular Patterns and Individual Mechanisms of the Complete Feed Nutrient Digestibility Process in the Cattle Digestive Tract

Object of research: digestion processes in high-yield cows of various physiological states and in youngsters of the Ukrainian Red-and-White dairy cattle. Subject of research: physiological patterns of nutrients digestion as a function of metabolizable energy, crude protein and diet fraction composition, as well as the process flow. Methods of Research: physiological, clinical, zootechnical, analytical, technological, mathematical and statistical ones. Theoretical and practical results, novelty: diet basic nutrient digestion patterns were determined as affected by different factors: feeding levels, metabolizable energy, crude protein content fraction composition. The process mechanisms of conversion of complete food mixture nutrients in the cattle multi-compartment stomach was elucidated and changes in nutrient availability for digestion in the small intestine were determined. The range of bulk feed fraction composition within which the structural parameter optimum is located was experimentally defined. A mathematical model to predict nutrient apparent digestibility trends and value changes in complete diets as a function of their characteristics and feeding methods was presented. The research results were used in production at Shans Agricultural Firm Ltd.; methodological approaches were included in Standard of the Ministry of Agricultural Policy of Ukraine SOU 01.21-37-558:2007 Feeds for Agricultural Animals. Methods of Evaluation of Feed Nutrient Availability for Digestion in the Ruminant Small Intestine, in the lecture courses of the Lugansk National Agricultural University.