The suitability of using optical-density (OD) measurements after a 6-h incubation period to determine bacterial
contamination on hatching eggs was evaluated.
A total of 154 hatching eggs, from five different flocks, were examined visually and bacterial counts and OD measurements
of egg washings after 6 h of incubation at 37°C were carried out to determine the levels of bacterial contamination,
and these results were compared.
A relationship between the OD measurements of egg washings and the log of the bacterial plate counts, was demonstrated.
The OD measurements provide accurate and quantative information to detect bacterial contamination on
hatching eggs, as they are simple to perform, repeatable and reliable.
The articles have been scanned in colour with a HP Scanjet 5590; 600dpi.
Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format.