Mixtures for carp fishes prepared in a loose form and an extruded form were stored at the temperature of 25°C, with humidity of 35–40% for three months. The quality of the lipid fraction was determined on the basis of monthly markings of acid value (LK), peroxide value (LN) and the content of vitamins A and E. Experimental factors did not result in any hydrolytic or oxidizing alterations in the lipid fraction, or in the content of vitamin E, which would be important for the feeding utility of the mixtures. Vitamin A deficiencies after extrusion amounted to 12%, and after finishing the storage test to 33% in relation to its content before extrusion.

In this paper was presented the technical analysis of laboratory device for infrared radiation of grain plant stuffs treatment. The device was designed and manufactured in Department of Food Process Engineering and Machines. It was described the device construction and operation principles. Furthermore, in this paper was presented scheme of temperature control and value of available temperature distribution which was obtained on the transporter tape.

The research carried out and the analysis of the results allowed an evaluation of the influence of capacity usage on the time of work and costs of transport. It was found that on the average for the tested transport sets increasing capacity usage from the lowest assumed interval (up to 0.30) to the highest (more than 0.81) gives considerable profits. The time of loading was decreased form 1.46 to 0.51 h·t^-1 and the costs of transport from 146.22 to 29.10 zł·t^-1 in T₀₂.