Productive characteristics of broiler chickens with a new phytoprebiotic feed additive included in the diet

Introduction. The results of studies on the effect of various dosages of prebiotic feed additives based on quercetin and lactulose on the productive characteristics of broiler chickens in the amount of 100 heads of the Ross-308 cross for 40 days are presented. During the experiment, three dosages of prebiotic were used: 0.25, 0.50 and 0.75%. As a result, a positive effect of the additive on the hematological and immune status of chickens, as well as on their meat productivity, was noted. Chickens of experimental groups I-III had better meat productivity by 107.9 (4.12%; P≤0.001), 135.7 (5.19%; P≤0.001) and 143.2 g (5.48%; P≤ 0.001) respectively, which was reflected in an increase in live weight gain and gross meat yield by 18.42; 21.14 and 21.87 kg. A decrease in feed consumption per 1 kg of live weight gain was established, respectively, by 3.66; 6.10 and 6.71%, which is due to the normalization of intestinal microflora, increased metabolic processes and a decrease in the level of free radical oxidation in the body of experimental chickens.
Material and methods. The experiment was carried out on Ross-308 cross broilers aged from 1 to 40 days. The keeping of poultry and the conduct of scientific research complied with Russian regulations (Order of the USSR Ministry of Health No. 755 of 08/12/1977 “On measures to further improve organizational forms of work using experimental animals” and “Guide for the Care and Use of Laboratory Animals” (National Academy Press, Washington, D.C., 1996). To reduce the suffering of animals and the number of samples used, appropriate measures were taken. A new feed additive with 50% dihydroquercetin and 50% of the drug "Laktuvet-1" was developed at the State Scientific Institution NIIMMP, Volgograd, in accordance with the standards of TU 10.91. 10-276-10514645-2023. During the experiment, three dosages of prebiotic were used: 0.25, 0.50 and 0.75%.Biochemical blood analysis was carried out on URIT-800Vet, URIT-3020 analyzers in a comprehensive analytical laboratory FGBNU NIIMMP (Volgograd, Russia).The results obtained were statistically processed using software, calculating the mean value (M), standard errors of the mean (±SEM) and the reliability criterion.
Results and conclusions. It was concluded that the new prebiotic feed additive improved the biochemical composition of the blood of broiler chickens, increased its resistance and level of safety. The best result was achieved with the addition of a phytoprebiotic additive in the amount of 0.50% in the diet structure, which had a positive effect on zootechnical and immunological parameters.

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