GROWTH OF RAINBOW TROUT FINGERLING AT DIFFERENT LEVELS AND RATIOS OF LYSINE AND ARGININE IN COMBINED FEED

Abstract

The article highlights the results of research on the influence of different levels and ratios of the amino acids lysine and arginine in compound feed and the growth and feed consumption of rainbow trout fingerling. For research, 6 groups were formed, 1 control and 5 experimental, each with 500 samples. Combined feed, which differed only in the content of lysine and arginine, was distributed 4 times a day at the rate of 3% of the weight of the fish. In the main period lasting 40 days, the level of arginine changed from 2.00 to 3.60% in compound feed against the background of 2 levels of lysine of 3.00 (groups 1–3) and 3.20% (groups 4–6). If the content of lysine in compound feed is taken as 100%, then the content of arginine varied from 62.50 to 120.00%. We determined the mass of trout, calculated absolute, average daily and relative growth, feed consumption per 1 kg of growth. With an increase in the level of arginine from 2.00 to 3.60% against the background of an effective level of lysine - 3.00% in the combined feed of rainbow trout fingerling, the weight of fish increases by 2.47-2.71% (р˂0.05), absolute, average daily and relative increases, respectively, by 3.04–3.24% (р˂0.05); 3.85% (р˂0.05) and 14.52–15.62 (р˂0.05)%, feed costs per 1 kg of growth decreased by 2.91–3.02%. An increase in the level of arginine from 2.00 to 3.60% against the background of an increased level of lysine - 3.20% in the combined feed of rainbow trout this summer led to an increase in the weight of fish by 2.71-4.30% (р˂0.001), an absolute increase - by 3.14–5.14% (р˂0.001), average daily growth – by 3.85–7.69% (р˂0.001), relative growth – by 12.69–26.49 (р˂0.001) %, combined feed costs per 1 kg of growth decreased by 3.02–4.85%. An increase in the level of lysine in the combined feed from 3.00 to 3.20% against the background of the basic level of arginine - 2.00% in the combined feed of trout this summer probably did not affect the weight and intensity of fish growth. In our studies, no antagonism phenomena between lysine and arginine were established. A one-sided increase in the content of lysine in compound feed did not lead to a decrease in the growth of rainbow trout fingerling. The high rate of growth of rainbow trout this summer was obtained with a ratio between lysine and arginine in compound feed of 1.05–1.20:1. The most effective ratio was 1.13:1.