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Lysine is an essential limiting amino acid in chick feeding. Its deficiency in feeds, especially of wheat-barley or corn-sunflower type, can reach 15-20 %. Dietary synthetic amino acids may negatively influence productivity due to imbalances caused by rapid amino acids entry into blood. This study continues a series of our experiments aimed at determining the efficiency of dietary synthetic lysine replacement by the microorganisms that synthesize L-lysine. Previous studies have shown a high positive effect of lysine producing Escherichia coli (Prolizer-BioR probiotic; JSC «Bioreactor», Moscow), however, seeking for similar producers among non-pathogenic microorganisms remains important. In this paper we present the findings in the support of Lactobacillus plantarum L211 probiotic (JSC «Bioreactor», Moscow) ability to optimize the gut microflora in view to increase the productive performance in poultry. Using the T-RFLP (terminal restriction fragment length polymorphism), we compared the cecal bacterial community in four groups of Cobb 500 broiler chickens at 35 days of age. The diet in group 1 (control) was a balanced combined feed. The broilers of groups 2, 3 and 4 were fed with dietary domestic probiotics containing lysine-producing Lactobacillus plantarum L-211, L. plantarum which does not produce lysine, or Bacillus subtilis (a daily rate of 1 ml for lactobacilli and 2 ml for bacilli). The concertation of all live bacteria was 100 million CFU/ml. Lysine producing L. plantarum L-211 increased the level of lactobacilli by 3.88 times (P < 0.005), of cellulolytic and amylolytic Clostridia by 1.13 times, and of acid utilizing Negativicutes by 1.36 times (P < 0.05), whereas, on the contrary, reduced the portion of pathogenic peptococci by 1.35 times (P < 0.05), staphylococci by 1.46 times and enterobacteria by 2.33 times (P < 0.005). However, L. plantarum L211, unlike L. plantarum or B. subtilis, did not affect the Fusobacteria or Enterobacteriaceae counts. Also, L. plantarum L-211 was not effective against pasteurella and actinomycetes which, on the contrary, increased in number 1.33and 2.75-fold (P < 0.005) as compared to the control. The lysineproducing probiotic strain resulted in the highest average live weight in broilers at day 35 and the highest average daily weigh gain (5.01 % and 5.14 %, respectively). L. plantarum L-211 also led to the lowest availability of lysine in the diet.

DIETARY PROBIOTIC Lactobacillus plantarum L-211 FOR FARM ANIMALS. I. THE ADDITIVE FOR BROILER CHICKS (Gallus gallus L.)