Related Clues:

• Bossy's bellow
• It's hardly the silence of the lambs
• Sound in 'Old MacDonald'
• Herd word
• Part of a stock exchange?
• Stock reply?
• Lea call
• Sheep trill
• Call from a pen
• Calf's cry
• Bucolic cry
• Holstein's hello
• Bovine bellow
• Pen chant
• Pen pal's response?