Feb 6 Tyson Foods Inc, the biggest U.S. meat processor, reported a 28.6 percent rise in quarterly profit, helped by higher exports of beef and pork and lower livestock costs. Net income attributable to Tyson rose to $593 million, or $1.59 per share, in the first quarter ended Dec. 31, from $461 million, or $1.15 per share, a year earlier.