Application of the Bernstein protein determination method in the study of the quality of feed raw materials of plant and animal origin

Abstract

For the purpose of practical application of the method of determining the mass fraction of protein according to Barnstein for various one-component feed raw materials of animal and vegetable origin, we conducted a series of experiments on four types of raw materials: fish meal, meat and bone meal, corn gluten, sunflower cake. To do this, each sample of feed was divided into 2 samples and an additive was introduced into each (one additive contained protein, and the other non– protein nitrogen). Determination of the protein nitrogen content in feed was carried out under the same conditions as the analysis of the initial samples. When comparing the theoretically calculated value and the practical result for all types of feed samples, reliable results were obtained. The conducted studies have shown the need to control raw materials to establish the true protein content in order to exclude the possibility of contamination with nitrogen-containing substances of non -protein origin.