Smithfield Foods Profit More Than Doubles  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; on  Thursday said quarterly earnings more than doubled due to  higher hog prices and the hog and pork producer's acquisition  of Farmland Foods last year. 
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