Effect of Ambient Environments on Survival of Selected Bacterial Populations in Dairy Waste Solids

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Abstract
Survival of potentially pathogenic organisms, especially those causing [cow] mastitis, indigenous to dairy waste solids was measured over an exposure of 12 days. Selected genera of bacteria were Staphylococcus, Streptococcus, Pseudomonas, Salmonella and Escherichia. Random samples were taken from 4 locations within each pile of dairy waste solids at 4 day intervals in 4 replicates. The number of streptococci and salmonellae markedly decreased after the first 4 days. The pseudomonad and coliform populations decreased a small but significant amount as did the staphylococci. These results could be partly due to various factors such as solar radiation, heavy metals in the solids or the approximate 45.degree. C increase in temperature within the piles.