No, but I’ve read that they’re hard to milk, here: http://www.theyeshivaworld.com/coffeeroom/topic/rav-moshe-feinstein-chalav-stam-vomiting/page/4#post-607365, and here: http://www.theyeshivaworld.com/coffeeroom/topic/rav-moshe-feinstein-chalav-stam-vomiting/page/4#post-608360.
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