Newswire reports that Tyson Foods, Inc., told investors at the BMO Capital Markets 2011 Farm to Market Conference that sales of chicken, beef and pork improved in the past two weeks as the weather turned warm. Donnie Smith, Tyson''s president and chief executive officer, and Noel White, senior group vice president of Tyson Fresh Meats, were presenters at the conference. According to White, a key factor driving price is the amount of protein available to U.S. consumers. According to USDA figures, protein supply has declined the past three years and is projected to decline again in 2011—an unusual trend. Strong exports have contributed to that trend.