Tyson Cuts Fiscal 2004 Earnings Forecast  CHICAGO (Reuters) - Tyson Foods Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=TSN.N target=/stocks/quickinfo/fullquote"&gt;TSN.N&lt;/A&gt; on Monday cut  its fiscal 2004 earnings forecast because of  weaker-than-expected demand for chicken and beef and  unexpectedly steep raw material costs.