Study of the effect of protein feed on the weight gain and liver condition of sterlet

¹ Kuban State Agrarian University named after I.T. Trubilin, Krasnodar, Russia
² Krasnodar Research Centre for Animal Husbandry and Veterinary Medicine, Znamensky, Krasnodar, Russia

^* Corresponding author: 4806144@mail.ru

Abstract

The aim of the studies was to determine the possibility of partial or complete replacement of fish meal with an alternative feed protein (gaprin) in the production of balanced feeds for sterlet. In the experimental groups, fish meal was replaced with gaprin in the following ratios: 50/50 - in group 2; 25 fish meal / 75 gaprin - in group 3. After 60 days, the final weight in group 2 was 6.4% higher than in the control; in group 3 - by 19.4%. The average daily gain in the control was 1.3 g; in group 2 - 1.4 g; the highest - 1.6 g - in group 3. The decrease in feed costs per 1 kg of gain, compared to the control, was in group 2 by 8.0%, in group 3 - by 10.6%. Histological studies have shown that when using 100% fish meal, the liver condition of fish is normal, in other cases deviations from signs of fibrosis to the initial stages of liver necrosis were noted. Blood parameters were within the norm for this age group of fish.