I was listening to a history class on the Chazon Ish, and it discussed his strong opinion that it is forbidden to milk cows in a beneficial way on Shabbos. Either it has to be done through a non-Jew, or the milk has to be disposed of.
In the class, it was mentioned that he publicized his opinion to oppose that of Rabbis associated with the Mizrachi movement, who allowed Jews milking cows on Shabbos, and benefitting from their milk. I was just wondering where can one can find their opinions in print, and some of their reasons for allowing it. I understand there's a concern for the pain that the cows are going through, but why would that permit benefitting from the milk, which was extracted through melacha?