Sanderson Farms Profit Below Estimates  CHICAGO (Reuters) - Poultry producer Sanderson Farms Inc.  &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=SAFM.O target=/stocks/quickinfo/fullquote"&gt;SAFM.O&lt;/A&gt; said on Tuesday its quarterly earnings more than  doubled on strong consumer demand for chicken, but its profit  was sharply below analysts' estimates.