Effect of diet formulation on basis of digestible amino acids and supplementation of probiotic on performance of broiler chickens

The aim of the study was to investigate the effect of diet formulation on digestible amino acids (DAA) basis and supplementation of probiotic Lactina on performance of broiler chickens. Four treatments were tested: TAA total amino acids diet formulation, DAA digestible amino acids diet formulation, TAA+L and DAA+L diets with Lactina supplementation. The probiotic preparation Lactina consisted of freeze-dried pure cultures of Streptococcus thermophilus, Enterococcus faecium and 4 strains of Lactobacillus. Each gram of Lactina contained 0.1x10 CFU. Formulation of diets for broilers on DAA basis promoted the existence of increased levels of poor quality protein sources (sunflower meal and meat and bone meal) and resulted in reduced feed cost per 1 kg of yield without negative influence on performance traits. Lactina fed chickens had decreased feed conversion ration, increased body weight and yield of carcass, meat, liver, gizzard and heart. The tested probiotic preparation did not affect the total cholesterol serum content and the small intestine morphometry but tended to reduce the total counts of bacteria and E. coli and to increase Lactobacilli concentrations in