Salmonellae from Animal Byproducts

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Abstract
Eight of 11 plants which reduce offal to reclaim protein as a feed supplement were producing supplements containing salmonellae. Unprotected storage of the offal following cooking and rendering was responsible for contamination in 1 plant. Byproduct samples, droppings from hens, eggs, and waste water used in byproduct processing were examined. The laboratory methods for isolation of salmonellae varied in accordance with the needs for the particular material being examined. A total of 94 isolations (27 Salmonella serotypes) were made from 71 samples of byproducts examined. One or more Salmonella serotypes were also isolated from 6 of 34 specimens of chicken droppings, 1 sample of plant waste water, and 2 of 52 specimens of egg slurries. To demonstrate the significance of the use of poultry feeds containing salmonellae, salmonellae-free hens were placed on feeds containing contaminated supplements. After 1 week, hens confined in laying cages were diarrheal and droppings contained salmonellae, but eggs were free of salmonellae. Other hens, housed loose, were also fed contaminated feed. Salmonellae were isolated from the shells of their eggs, and after 1 week of unrefrigerated storage they were isolated from the egg yolks.