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Are you aware that much of the E. coli contamination that takes place in meat happens in the slaughterhouse? E. coli contamination occurs when meat comes in contact with animal manure. So, it is a given that the cleaner the animals (the less manure that is sticking to their bodies) the less likely E. coli contamination can take place.
The digestive system in grass fed animals runs at 7 pH versus 4 pH in grain fed animals. Ecoli 157 will not survive in the stomach of a grass-fed animal due to the high pH.
Cattle raised in feedlots are generally in filthy conditions when they reach the slaughter house. Feedlot animals are forced to stand all day in tight conditions in manure and dirt. It is nearly impossible to remove all the fecal matter from them. Pasture raised animals (a.k.a. grass-fed beef) are cleaner animals because they are not confined. Grass-fed beef has free roam of clean pastures and they are not forced to stand in bunches inside an unsanitary feedlot. The only way to cut down your risk of getting E. coli is to purchase grass-fed beef.