Abstract
A dairy holding lot was divided into sub-lots, one of which was flushed with recycled dairy lagoon wastewater from the third cell and the other flushed with domestic water. The sub-lots were sampled at 7 am and 11 am on each of two consecutive days in July and September. Samples were tested for total plate count (TPC), total coliform (TC), fecal coliform (FC), fecal streptococcus (FS), Salmonella, Shigella, Klebsiella, Staphylococcus (S) and other streptococci. Analyses of log-transformed data showed no difference in TPC, TC or S between water sources. A similar trend was seen for FS and other streptococci. There was a marked reduction in TPC and S after 4 h of exposure to sunlight but there was no difference in TC. Swabs of cows' teats showed no difference for TPC, TC, FS, S or other streptococci between water sources. Recycled third-cell wastewater did not increase enteric indicator organisms or add other potential pathogens to the feedlot environment.
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