TREATMENT OF SALMONELLA-ENTERITIDIS ARTIFICIALLY CONTAMINATED HATCHING EGGS WITH PRESSURE-DIFFERENTIAL-DIPPING (PDD) USING ANTIBIOTICS

Investigations have been carried out to evaluate the influence of PDD- treatment using 1500 ppm gentamicin sulfate and 600 ppm enrofloxacin o n the S. enteritidis reisolation and hatchability rates of artificiall y infected hatching eggs (layer type). A significant correlation betwe en weight gain and the antibiotic concentration in eggs was observed. On the other hand, no correlation between the fluid uptake and initial egg weight was found. After dipping artificially infected hatching eg gs in gentamicin for 10 min and 5 min at reduced pressure, no S. enter itidis was reisolated from freshly hatched chicks. The same results we re obtained using enrofloxacin applying reduced pressure for 10 min. U sing enrofloxacin at 5 min reduced pressure S. enteritidis could be re isolated from 2-4% of the newly hatched chicks.