Abstract
Intensive technologies for breeding farm animals and poultry are largely determined by the balance of feeding diets based on essential substances. A certain shortage in the domestic feed market and insufficient control over the turnover of protein-containing feeds, including feed amino acids, leads to feed adulteration by replacing proteins and individual essential amino acids with cheaper ingredients. The purpose of the research was to establish the possibility of operational quality control of feed amino acids – lysine, methionine and threonine based on the results of a comprehensive analysis for the content of active ingredient and crude ash. The scientific significance of the work is determined by the justification of the possibility of detecting adulteration of feed amino acids by the mass fraction of crude ash. This method offers testing simplicity, making it suitable even for laboratories at feed milling plants. During the experiment, the mass fraction of crude ash exceeded the regulatory values by 0.06 % in 7 industrial samples of feed lysine, by 0.02 % in 4 industrial samples of methionine, and by 0.15% in 9 industrial samples of feed threonine, out of a total of 70 samples tested in each group. The modeling of the recipe composition of feed amino acid samples was carried out with the addition of milk whey, wheat flour, edible salt and potato starch in quantities of 2 %, 5 % and 10 %. In all samples of feed amino acids, an increase in the mass fraction of crude ash above the standard values was noted with the addition of 2 % edible salt and with the addition of 10 % milk whey (except for feed methionine). When wheat flour and potato starch were added, the quantitative indicators of crude ash mass fraction changed insignificantly. The obtained data on the increased ash content in feed amino acids indicate the possibility of adulteration through the addition of non-nitrogenous ingredients.