Tyson Foods announced it will shut one large beef plant and slow down another.  The facility shutdown is in Lexington, Nebraska and the plant that will experience a slowdown is in Amarillo, Texas, which will run just one shift per week.  The move to “right-size” the company’s beef business comes after Tyson reported in its latest quarterly earnings report that the beef division, for the company’s just-ended fiscal year, booked an operating loss of $1.1 billion, nearly triple the loss of a year ago. Its operating margin is in the red and widening from 1.9 to 5.2 percent. The company forecasts an adjusted operating loss in its beef segment of $400 million to $600 million next year.  Tyson stock price is...