Diseases of intestinal infections of chicken-broilers and their resistance to antibiotics

One of the leading places in the structure of bird death is intestinal infections, in their etiology a significant role is played by associations of pathogenic and opportunistic microorganisms. To carry out effective antiepizootic measures, there is a need for microbiological monitoring. The aim of the study was to study the species composition of causative agents of intestinal infections of broiler chickens and their resistance to antibiotics. Objects of research were sick and dead broiler chickens with signs of intestinal lesions. During the period 2014-2017, bacteriological studies of 534 samples of biomaterial were carried out. In the contents of the intestines of broiler chickens with signs of diarrhea, an increase in the number of pathogenic and opportunistic microorganisms was observed (hemolytic bacteria, enterobacteria exceeded the norm by 2.0-2.5 lg CFU/g, staphylococci by 4.7-5.3 lg CFU/g, enterococcus - 0.4-0.7 lg CFU/g) and a decrease in useful microflora (lactobacilli was below the norm by 0.2-1.0 lg CFU/g and bifidobacteria by 0.2-1.2 lg CFU/g). From the dead broiler chickens in intestinal infections, nine species of pathogens, represented by various associations, have been identified. The highest percentage was occupied by the association Esherichia coli + Staphylococcus aureus + Enterococcus faecalis (49.1%). Analysis of the resistance of isolated pathogens of intestinal infections of birds showed that most antibiotics used in poultry farms had low activity.