Smaller farms are unlikely to use anything like this. Many already use kelp, which also supposedly reduces methane. Just buy from the smallest dairies and find out about their practices. Many farms (even organic) do vaccinate their cows, so that's already something to think about. Almost all chickens get a GM vaccine at the hatchery. I believe they spray it on the eggs. Many organic farmers are not even aware of this and only a few hatcheries are willing not do it, but you need to request that.
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