Research conducted at the University of Leicester in the United Kingdom shows that playing slow music for cows results in more milk.

In the study that used 1,000 Holstein cows, researchers played music 12 hours a day — from 5 a.m. to 5 p.m. The cows that heard slow music — defined as less than 100 beats per minute such as Beethoven’s “Pastoral Symphony” — produced 3 percent more milk than cows that heard fast music defined as greater than 120 beats per minute such as the Beatles’ “Back in the USSR.”

Daily milk yield rose by just over 1.5 pounds, says scientists Adrian North and Liam MacKenzie with the Music Research Group in the School of Psychology at the University of Leicester. That increase in milk production, says the researchers, indicates that slow music alleviates stress and relaxes the animals and they respond by producing more milk. The researchers had already proven a correlation with slow music and relaxation in humans and wanted to see if the same would hold true in cows.

Milk production results of the study were as follows:
Slow music = 50.88 pounds of milk per day.
No music = 50.48 pounds of milk per day.
Fast music = 49.36 pounds of milk per day.

Daily University Science News