<div>From: Zev Sero </div>
<div>Around the rest of the world, milk is not produced for the Jewish market<br>on Pesach. We buy all our milk before Pesach, so that anything that<br>might somehow have got into it will have become batel. Those who are<br>
super-careful strain it to be sure that there is no solid foreign matter<br>in it, which would not be batel. So what goes on during Pesach is of no<br>concern to us. The goy will produce milk as he usually does, and will<br>
sell it to his fellow goyim, and after Pesach we will resume buying from<br>him as usual. But if you have a Jewish dairy farm, it can't just shut<br>down during Pesach; it's producing milk, in which any chametz would not<br>
be batel, so the situation is quite different.</div>
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<div>See RM Landau's reasoning here:</div>
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