Possible Clues:

• Borden cow ... and a phonetic hint to this puzzle's four longest answers
• Bovine of ads
• Bovine advertising icon
• ___ Janis, star of Broadway's 'Puzzles of 1925'
• Cow on the carton
• "Eighth Grade" star Fisher
• Classic spokescow
• Commercial mascot with an honorary Doctor of Bovinity degree
• Old comic actress ___ Janis
• Fisher of "Eighth Grade"