As mentioned above if you worry about Treifos you probably cannot drink milk at all. DA cows are not common enough that there should be anywhere near a Rov. If you are worried about Shishim then you probably should not drink any milk sold by a company that mass-produces milk. If you are going to really on everyone’s Heter that only Rov would be a problem (because it’s Yavesh Beyavesh Veachar Kach lach Belach) then DA isn’t a problem either.
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