WOOD BIOLOGICALLY ACTIVE COMPONENTS IN COWS FEEDING
The use of biologically active feed supplements based on the processing products of local forest resources is a promising direction for increasing the productivity of farm animals. Forest biomass is characterized by a high content of biologically active and nutritious substances, which is valuable for feed production. The aim of research is to study the effect of feeding the complex feed supplement consisted of coniferous flour, pine nut shell, and arabinogalactan on the changes in physical and chemical properties of milk and metabolic parameters of cows in the Krasnoyarsk Krai. The research was carried out on two groups (control and experimental) of the Black-and White breed milk cows at the age of first calving selected on the bases of the principle of analogues. According to the research design, both groups of cows were fed with the same balanced basic diet. The cows of experimental group were fed with coniferous flour (50 g/head/day), crushed pine nut shells (50 g/head/day), and arabinogalactan (5 g/head/day) in addition to the basic diet. The analysis showed that studied supplements do not have a negative impact on cow metabolism since the biochemical parameters of blood and urine correspond to healthy animals. Complex feeding of tested supplements increased concentration of total protein in the blood of cows by 7.3 %; glucose - by 6.7 %; calcium - by 10.8 %; phosphorus - by 8.6 %; iron - by 10.1 %; magnesium - by 3.8 %. An increase in the level of milk fat by 0.6%, lactose - by 0.2%, and dry matter - by 0.7% was found during the analysis of physical and chemical properties of cow milk.