UK's Bakkavor jumps on rejecting two takeover proposals from rival Greencore

** Shares of fresh food products provider Bakkavor jump as much as 18.9% to near 6-1/2-year high of 179.5p** BAKK top pct gainer on FTSE 250 midcaps index** Co rejects two proposals from UK-based convenience food manufacturer Greencore ** Revised proposal implied total equity value of 1,139 million pounds ($1.47 billion) ** GNC's second proposal was for 85p in cash and 0.523 Greencore share for each Bakkavor share ** As of last close, stock up ~21.92% YTD ($1 = 0.7732 pounds)