Dankiv V. Digestibility and use of nutrient and mineral substances when feeding calves with protein-fatmineral addition (PFMA)

The thesis presents the theoretical and experimental material concerning the use of protein -fat-mineral addition (PFMA) as a constituent part of starter mixed fodder for feeding calves of milk period. The addition created for the Precarpathian region includes corn of forage beans, peas and winter crops corn rape in combination with deficient salts of microelements (Cu, Co, J) and contributes to balancing the ration of calves as to energy, protein, fats and deficient microelevtnts. The change of level of fermentative and syntrhetic processes in the contents of the paunch, which are conductive to paunch metabolism, is fixed. The improvement of paunch metabolism by feeding PFMA conforms to the rise in the coefficient of digestibility and the assimilation of nutrient substances of the ration, to better use of nitrogen, calcium, phosphorus, cuprum and cobalt. Data analysis of gas and energy interchange and of energy balance in the organism of calves of experimental groups showed that oxidizing and reduction processes were more intensive which fully conformed to the indices of growth and development of calves.The average daily additional weight of calves in experimental groups was equal to 810--835 gx as against 751 grams in a control group (starter mixed fodder contained 19% of ailcare as to mass. The study of morphological and biochemical blood composition showed that the investigated indices of nitrous, carbohydrate and fat interchange, basic ferments of substance intechange were within the phisidogical norm.The use of PFMA as a constituent of starter mixed fodder (19% as to mass) contributed to the reduction of the expense of fodder energy (fod. Unit) per unit of additional weight and lowered its cost price. We recommend to use 19% of PFMA as to mass as a constituent of starter mixed fodder for balancing the ration when breeding calves of milk period.