The article presents the results of studying the pellets crumbliness index of a pilot batch of extruded compound feed for pike-perch. The regimes of extruded pellets fish compound feed production with minimal crumbling were defined using a mathematical model. A 3-factorial central composite design was implemented to obtain a mathematical model of the process of extrudate resulting in the second-degree polynomial. The process influencing factors include the feed mixture moisture W (%), extrusion temperature T (°C) and steam pressure P (MPa). Experimental studies were conducted according to the experimental plan. The experimental data obtained were entered into the planning matrix. Experimental data was processed in a program prepared in Microsoft Excel.  As a result, an adequate second-order mathematical model describing the dependence of the crumbliness index on the feed mixture moisture before extrusion, extrusion temperature and steam pressure was obtained. The mathematical model adequacy was tested based on Fisher's variance ratio. The Fisher criterion is an important statistical tool for verifying the adequacy of the model and analyzing the variance. The analysis of the obtained model and its graphical interpretation are presented. A good extrusion process mathematical model was developed. The fundamental principles of feed mixture processing on a single-screw extruder and the choice of its rational parameters ensure the production of extruded compound feed pellets for pike-perch with minimal crumbling were studied. A minimal crumbling is provided at the following values of the factors - feed mixture moisture before extrusion is 32%, extrusion temperature is 132 °C, and pressure is 0.4 MPa. In the selected levels of factors, the calculated value of extruded pellets crumbling was 1.02%.

The article presents the results of developing recipes for domestic extruded starter compound feeds for zander, tilapia and Clary catfish. Technological modes of their production, as well as physical-chemical, mechanical and technological indicators of the developed compound feeds are established. The developed compound feeds are well-loose grains of dark and light brown colors, with sizes from 0,2 to 2,0 mm. Indicators of water resistance were at least 2,5 hours, crumbling no more than 1,5 %, swelling of granules 10-15 minutes, volume mass below 1000 kg/m3. The data obtained show that the developed feed meets the regulatory requirements for starting fish feeds. The introduction of the developed technology for the production of starter compound feeds at domestic enterprises of the feed industry will reduce the dependence of industrial fish farms on the import of compound feeds and thereby increase the profitability of the industry.

The dynamics of changes in the quality indicators of the starting compound feeds produced by extrusion for zander, clary catfish and tilapia during their storage for 10 months has been studied. Warehousing was carried out in the spring-summer period, the air temperature in the warehouse ranged from +5 to +25 °C; relative humidity - from 60 to 75 %. Sampling for analysis was carried out during storage, after 2, 4 and 10 months of storage. It was found that, during storage, the content of crude protein and fat does not undergo significant changes, an increase in the acid and peroxide numbers of fat is observed in all samples, the acid number of fat increased to 29,5 mg KOH/g in the feed for zander, to 28,3 mg KOH/g in the feed for clary catfish, and in the feed for tilapia to 26,84 mg KOH/g. The peroxide number of fat increased from 0,1 % iodine to 0,22 % iodine in the feed for zander, from 0,1 % iodine to 0,19 % iodine in the feed for clary catfish and in the feed for tilapia 0,1 % iodine to 0,18 % iodine. It is noted that in pike perch feeds for 10 months of storage, the peroxide number reached 0,22 % iodine with an acceptable deviation in parallel determination of 0,05 %, the remaining indicators for feed safety were at the limit level in terms of the content of peroxide and acid numbers of fat, it follows that the feed should not be stored for more than 10 months.

The article presents the results of analyzes of the chemical, amino acid, mineral, vitamin composition of flax cake of the Kazakh variety «Kostanayskiy 11». A recipe for a complete feed for broilers with the introduction of flaxseed cake and a premix based on vermiculite filler has been developed. The optimal rates for the in troduction of flaxseed oil into the recipe for a complete feed for broilers aged 29-56 days have been determined. The proposed recipes for mixed feed for broilers using flaxseed cake of the Kazakh variety «Kostanaysky 11» and a premix based on vermiculite filler in feeding poultry will make it possible to balance the rations not only in protein and mineral composition, but also partially replace expensive soybean meal, thereby reducing the cost of compound feed.

This article presents the results on creating the probiotic preparation with inclusion of microorganisms of highly productive lactic bacteria cultures with high biosynthetic and bactericidal properties. Conditions for production of bacterial preparation and multicomponent mix for flour enrichment and bread making were developed. Composition of the produced improving agent and premix for flour enrichment was studied and conditions for flour enrichment using the produced biological improving agent based on lactic bacteria were developed. Technological parameters of flour semi-products where determined on addition of the enriched flour. It was determined that produced improving agent plays a key role in transformation of protein-proteinase and carbohydrate-amylase flour complex, thereby improving the structuralmechanical properties of dough and further resulting in production of elastic crumb with thin-walled and even texture.