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Billionaire Carl Icahn has stepped up his fight with McDonald’s over the welfare of pigs used in its food chain. Mr. Icahn, whose no-nonsense reputation for shaking-up companies made him a Wall Street legend, wants to put two people on McDonald’s board. He owns only 200 McDonald’s shares but, reportedly spurred on by his animal welfare activist daughter, that gives him leverage to agitate for change. McDonald’s says it has led the way in improving animal welfare standards. The battle centres on claims about pregnant sows being kept in small crates, a practice Mr. Icahn said was “obscene”. He said…