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Obtaining highly homogeneous mixtures is an urgent task in many areas of feed production, as it is associated with the need for even distribution of particularly important and valuable components. Manufacturers of animal feed are using several different methods for performing homogeneity studies to check their mixer performance. This paper is devoted to the use of nontraditional markers such as ferromagnetic Microtracers to evaluate the homogeneity of the final feed. Microtracers have successfully been used in a mixer testing program in the USA since 1985 and in Europe since 2006. They represent a major improvement over traditional analytical procedures for evaluation of mixer performance involving the use of cobalt or manganese salts. The authors described the quantitative results of determination and identification of Microtracers in two sets of 20 samples of pet food manufactured by Kormotech LLC with using a proprietary Rotary Detector procedure developed by Micro-Tracers Inc (San Francisco, California). It was shown that analysis of 150 g samples at level of Microtracer addition of 20 g per metric ton of pet food allowed a magnetic retrieval of the number of ferromagnetic particles from 61 to 101 which was sufficient for application of Poisson and Chi-squared statistics. The obtained results from two tests performed with different time of mixing were interpreted in accordance with the requirements of the GMP + BA2 standard. It was determined that mixing within 3 min leads to the marginal mixing with the calculated probability value of 1.12%. The prolonged mixing within 4 min leads to complete mixing with the calculated probability value of 5.93%. The use of ferromagnetic Microtracers in a mixer testing program is justified for such tasks as comparison of mixers with each other, as well as identifying the changes in the technical characteristics of the mixers and their performance occurring during their exploitation. In addition, using microtracers can quickly determine the quality of the mixing equipment when it is purchased. Keуwords: mixing, compound feed, food quality, microtracers, markers, pet food, the Rotary Detector. Introduction. Formulation of the problem Despite the rapid growth of the global pet food market, the domestic market demonstrates the untapped potential [1, 2]. Conducting basic scientific research in the direction of developing new formulations and technologies for the manufacture of finished feeds [3] include the following: studying their usefulness, quality and safety, improving existing and developing new methods for monitoring quality [4]. The results of this basic research are able to contribute to improving competitiveness and increasing the share of domestic producers in the industrial feed market for unproductive animals An effective method for the production of pet food based on meat and vegetables using poultry offal for meat and bone meal is described in study [5]. The formulation of the combined meat and vegetable pet food developed and optimized by the authors meets the physiological needs of the animal’s body and meets the established regulatory requirements. European law tightens the use of slaughter byproducts, and since 2002, the EU has banned the use of secondary poultry products for animal feed and pet food [6]. The lack of adequate dietary protein is a problem in feeding domestic animals. The market of pet food today is developing dynamically and its annual growth averages at level of 1225% [7]. Such countries as Germany, France, Great Britain, the USA and China are among the most significant producers and importers of pet food. Due to the current political and economic situation in the world, many importers have reduced supply volumes. On the other hand, an increase in the population of domestic animals causes a natural increase in pet food intake. Thus, a favorable situation is currently developing for the development and promotion of new pet food products which consist of numerous important and valuable ingredients. Obtaining highly homogeneous mixtures of these ingredients is an urgent task in many steps related to the pet food production. Therefore, the manufacturers of these products must have a solid evidence of the high quality of their materials based on accurate dosing and uniform mixing of all components [8]. To our time, there is no single methodology for determining the quality of mixing adopted in Ukraine. The methodology for determining the quality of mixing refers to the international standard [9], the practical ap-

ASSESSING THE QUALITY OF HOMOGENEITY OF PET FOOD USING FERROMAGNETIC MICROTRACERS