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Smithfield Foods Profit High on the Hogs  CHICAGO (Reuters) - Smithfield Foods Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=SFD.N target=/stocks/quickinfo/fullquote"&gt;SFD.N&lt;/A&gt;, one of  the nation's largest meat producers, on Thursday said quarterly  earnings more than doubled due to higher hog prices and its  acquisition of Farmland Foods last year. 