Possible Clues:

• Herd comments
• Says 'hi' in Cow
• What's heard from a herd
• Jersey sounds
• Sounds heard by 57-Across
• Low notes?
• Communications common in Jersey?
• Q: 'Did you hear about the cow that cried wolf?' A: 'Fake ___!' (dad joke)
• Pastoral chorus
• Herd noises