New generation protein supplement in combined feeds for broiler chickens

Federal Scientific Center All-Russian Research and Technological Poultry Institute RAS, 10 Ptitsegradskaya Str., 141311 Sergiev Posad, Moscow region, Russia

^* Corresponding author: andrianova@vnitip.ru

Abstract

In experiments on broiler chickens of the SGC “Smena” selection, it was found that the partial replacement of fish meal with an additive based on a protein of microbial origin, containing 68.3% of crude protein, allows to provide a live weight of chickens comparable to the control with high poultry safety, due to good protein digestibility and availability of amino acids. A comprehensive assessment of the productivity of broilers according to the productivity index showed that the replacement of 50% of fish meal with microbial protein contributed to an increase in the productivity index of chickens of the second group by 4.78 points in comparison with the control. The complete replacement of fish meal in the third experimental group was less effective, as evidenced by a decrease in the productivity index to 303.91 points compared to 308.73 in the control. It is shown that the introduction of a protein supplement into the feed for broiler chickens in Analysis of the chemical composition of the liver of 35-day-old broilers showed that the protein content in the liver of chickens of the second and third groups was higher than the control by 1.99 and 0.58%, while there was no increase in the fat content in the groups with a protein supplement. The crude fat content was at the level of 11.38 and 12.20% versus 13.0% in the control, which indirectly indicates the absence of a cytotoxic effect on liver cells from the use of microbial protein in the studied dosages.