The pig industry has expanded, with larger numbers of sows per farm, plus a increased regional concentration of pig farms. As a result, management of manure as fertilizer came to be inadequate. Therefore, some pig producers disposed of the manure on non-agricultural soil, or worse, dumped in rivers and lakes causing enviromental contamination. In Mexico, physical treatments such as sedimentation and mechanical separation are common. These treatments yield liquid and solid fractions, which are used tofeed cattle and some imes swine. However, these treatments do not destroy pathogens like: Salmonella spp. and enterotoxigenic E. Coll Therefore, the objectives of this work were to determine: 1) the count of enterobacteria, and 2) the presence and serotype of Salmonella spp. and enterotoxigenic E. Coli, in liquid and solid samples, collected from 10 pig farms in central Mexico.
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