Investigații microbiologice ai incidenței bacteriilor Salmonella spp. la unele unități avicole de producere a ouălor

The purpose of the respective research was focused on establishing the incidence of Salmonella spp. bacteria in some poultry enterprises and the prevalence of Salmonella bacteria in the background of the microbiome present in laying hens units. The study was carried out on fecal samples taken from poultry units, as well as on samples taken from the dead laying birds at the same period of examination. For isolation and identification of bacterial microbiome and Salmonella bacteria serotypes were used selective and differential culture media, including special media for Salmonella identification. The research was carried out at three stages of the egg production process as before the laying period, in the meddle and towards the end of the laying period. The obtained results show that the index of Salmonella spp. bacteria in faces had relatively low variations before the laying period, such as (0.65±0.16 log UFC/g at the age of 145-165 days, with an insignificant increase in the middle of the laying period, reaching the index of 0.71±0.08 log UFC/g, with a doubling of the indices up to 1.66±0.24 log UFC/g (p>0.05) at the end of the laying period (450-470 days). In case when the samples were taken at the same studded periods from the dead laying hens, the index of bacteria of the genus Salmonella increased from 2.61±0.15 log UFC/g at the beginning of egg production (145-165 days) and increased considerably up to 3.38±0.26 log CFU/g at the end of the egg laying period (450-470 days). The obtained results demonstrate that towards the end of the laying period, the number of conditionally pathogenic bacteria increased and at the same time the number of bacteria from the genus Salmonella increases significantly, a fact that could also lead to the outbreak of bacterial diseases in poultry flocks, especially salmonellosis.