Possible Clues:

• Org. with a plow on its seal
• Org. that rates meat 'Choice' or 'Prime'
• Org. whose seal features a plow
• Its flag depicts corn and a plow
• Letters on some meat packaging
• Stamp on a turkey
• Letters on butcher shop stickers
• Org. that has a beef with bad beef
• Butcher counter letters
• Egg-grading agcy