Microbiological Quality of Protein Feed Supplements Produced by Rendering Plants1

Abstract

Samples of protein feed supplements produced by rendering plants were examined for salmionellae, total aerobic bacterial counts, coliform counts, and enterococci. Isolations of salmonellae were more frequent from products with high counts; however, 6% of the samples with total counts of less than 1,000 per gram and 14% of the samples with coliform counts of less than 1 per gram contained salmonellae. Serotypes of Escherichia coli which have been associated with disease in domestic animals and poultry were also isolated from products. Although the distribution of

Polymerase chain reaction detection of bacterial ribosomal genes from fresh and stored animal feeds

“…The predominant microbial species in animal feed may also vary between different feed types and processing conditions. Loken et al 7 reported that Micrococcus and Bacillus predominate in protein feed supplements, while Cox et al 2 isolated Eterobacteriacae such as Enterobacter agglomerans, Ent cloacae and Klebsiella pneumoniae from commercial poultry diets. In a series of studies, Ha et al 4, 6, 8–10 detected aerobic populations ranging between 10 4 and 10 7 CFU g −1 in a soybean meal‐based poultry mash, and an average population of 10 5 CFU g −1 in feed containing meat and bone meal.…”

Screening of Feed Components for Salmonella with Polyvalent H. Agglutination

“…The occurrence of salmonellae in feed and feed components has frequently been associated with the use of contaminated animal protein supplements processed by rendering plants (1,(4)(5)(6)(7)(8).…”