Microbiological Decontamination of Poultry Feed—Evaluation of Steam Conditioners

✍ Scribed by Blank, Greg; Savoie, Susan; Campbell, Lloyd D

• Book ID: 102648783
• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 611 KB
• Volume: 72
• Category: Article
• ISSN: 0022-5142
• DOI: 10.1002/(sici)1097-0010(199611)72:3<299::aid-jsfa656>3.0.co;2-a

✦ Synopsis

The microbial decontamination of chicken feed, obtained from a commercial pellet mill, was evaluated using a direct-fired steam conditioner (DFSC; APC System@). The standard plate count of the feeds before (mash) and after (pellets) conditioning ranged from 65 x lo4 to 83 x lo5 colony forming units (CFU) g-' and from 91 x 10' to 92 x lo3 CFU g-', respectively. The incidence of Escherichia coli, Salmonella and Listeria in the feeds before conditioning was 61.7, 8.3 and 27.1%, respectively. Following conditioning these levels were reduced to 1.7, 1.7 and 0%, respectively. Species of Listeria and Salmonella identified included L monocytogenes, L innocua and S agona, S ohio, S heidelberg, S senftenberg, S tallahasse and S braenderup, respectively. Compared with a conventional, indirect-fired boiler-generated-steam conditioner (IFSC) the directfired steam conditioner proved superior in regards to pathogen decontamination; no E coli, Salmonella or Listeria were recovered from mash lots positive for these microorganisms. However, with the IFSC system, both E coli and L monocytogens were recovered at levels of 11.1 and 5 6 % , respectively.