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Microbiological Decontamination of Poultry Feed—Evaluation of Steam Conditioners
Author(s) -
Blank Greg,
Savoie Susan,
Campbell Lloyd D
Publication year - 1996
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/(sici)1097-0010(199611)72:3<299::aid-jsfa656>3.0.co;2-a
Subject(s) - human decontamination , conditioning , food science , boiler (water heating) , pulp and paper industry , biology , waste management , mathematics , statistics , engineering
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 65×10 4 to 83×10 5 colony forming units (CFU) g −1 and from 91×10 1 to 92×10 3 CFU g −1 , 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 direct‐fired 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.