ilovetorah: the marvels of modern technology can help you (and us) access the relevant sources rather easily. Just “google’ “DA COWs’ and you will find a relevant article from the OU on this. Incidentally, the Shach is one source for not calling something treife if it lives a year. See article.And hello99 is absolutely right in his understanding. The element of “shishim’ is only relevant if we KNOW that there was treife milk and it is mixed with kosher milk. The situation here is totally different because (as he writes so eruditely) we can assume that every cow we milk is kosher based on what is the “rov” (majority).
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