4. Tyson Foods ( TSN) engages in the production, distribution and marketing of chicken, beef, pork, prepared foods and related products. For the second quarter, analysts polled by Bloomberg estimate a 9% increase in net revenue to $7.5 billion from $6.9 billion in the year-ago quarter. Earnings per share are seen at 44 cents for the quarter. Meanwhile, Jefferies estimates pork margins to expand by 360 basis points during the second quarter. Also, it forecasts favorable feed contracts to offset the pressure on chicken industry. Tyson is scheduled to release its second quarter 2011 earnings on May 9, 2011. For 2011, the company projects revenue at $31 billion. In addition, production is seen increasing slightly, however not outpacing the estimated export growth. Meanwhile Bloomberg estimates earnings per share for full year 2011 at $2.11. Of the 17 analysts covering the stock, 59% recommend a buy while 41% rate a hold. There are no sell ratings on the stock. Analysts polled by Bloomberg expect the share value at $22.18 with an upside of 15.4%.