Abstract
Experiments were carried out for the evaluation of a disinfectant solution to kill bacteria on the egg shell surface. The egg shells were artificially contaminated with Escherichia coli or Staphylococcus aureus. Three kinds of disinfectant solution were used, a mixture of phenol derivatives, invert soap and iodophor. When a volume of disinfectant solution was sprayed per 1m3 capacity either 300ml of solution diluted 1 in 50 or 100ml solution diluted 1 in 100, bacteria were recovered from almost all samples regardless of the spraying volume used and the concentration of the solution.
When the contaminated egg shell were dipped in the solution diluted 1 in 100 kept at 40°C for 4 minutes, the number of recovered bacteria decreased to 101 to 103 organisms. Even when the dipping period was prolonged to 8 minutes, 101 organisms still survived.
The efficacy of disinfectant solution is not sufficient to provide a satisfactory degree of disinfectaon of the egg shell when the egg is heavily soiled.
