Quick Answer
Cows give a bit more milk when they listen to gentle music than to loud, upbeat tunes. This suggests that a cow's mood, specifically how relaxed or stressed they are, can directly influence their milk production, which is quite fascinating for animal welfare and farming efficiency.
In a hurry? TL;DR
- 1Playing slow, calming music to dairy cows can increase milk production by around 3%.
- 2Cows respond to the tempo of music, not the genre; slower beats are more beneficial.
- 3Slow music (under 100 bpm) promotes relaxation, reducing stress hormones and aiding milk let-down.
- 4Fast-paced music (over 120 bpm) can agitate cows, potentially decreasing milk yield.
- 5Music can mask stressful farm machinery noises, improving the cows' overall environment.
- 6Implementing calming music is a low-cost strategy to enhance both animal welfare and farm productivity.
Why It Matters
It's rather surprising that a cow's milk yield is measurably affected by the tempo of the music it hears.
Dairy cows produce roughly 3% more milk when listening to slow-tempo, calming music compared to faster, more upbeat tracks. This suggests that the psychological state and stress levels of livestock have a measurable impact on agricultural productivity.
The Leicester Rhythm Experiment
Research conducted at the University of Leicester’s School of Psychology found that cows responded significantly to tempo. While listening to slow music like REM’s Everybody Hurts or Beethoven’s Pastoral Symphony, cows produced about 0.73 litres more milk per day than when they were played fast-paced songs like Wonderwall or Tiger Feet.
The study, led by psychologists Dr Adrian North and Dr Liam MacKenzie, monitored a herd of 1,000 Holsteins over nine weeks. By alternating 12-hour periods of silence, fast music, and slow music, the researchers isolated tempo as the primary variable influencing the herd.
Why Tempo Matters to a Herd
The core of the phenomenon lies in cortisol levels. Cows are sensitive animals; environmental stressors can trigger the release of adrenaline and cortisol, which inhibits the release of oxytocin, the hormone responsible for the milk let-down reflex.
When a cow is relaxed, oxytocin flows freely. Slow music—specifically tracks with a tempo of less than 100 beats per minute—appears to create an auditory environment that mimics the low-frequency humming or natural sounds of a calm pasture. Contrast this with fast music, which typically exceeds 120 beats per minute. The frantic pace may mimic the sound of alarm or chaos, keeping the animals in a state of mild agitation.
Putting the Playlist to the Test
The specific tracks used in the 2001 Leicester study provide a strange window into bovine taste. The most successful songs included:
- Bridge Over Troubled Water by Simon & Garfunkel
- Moon River by Danny Williams
- Orinoco Flow by Enya
On the other side of the spectrum, high-energy tracks like Space Cowboy by Jamiroquai and Pump Up The Volume by MARRS resulted in the lowest yields. Dr North noted that the music likely works by distracting the cows from the industrial noise of the milking parlour, such as the clatter of machinery and the hiss of pneumatic pipes.
Unlike other sensory interventions, such as changing lighting or diet, music represents a low-cost, high-yield method for improving animal welfare and farm efficiency.
Industrial and Cultural Implications
Modern dairy farming has increasingly adopted these findings. High-tech "smart farms" often integrate sound systems into their infrastructure. In some automated milking systems, cows choose when to be milked, and the presence of soothing background noise encourages them to enter the milking stalls more frequently.
Beyond Leicester, other studies have looked at different variables:
- European Research: Some Spanish farmers have reported that playing Mozart helps prevent "bovine depression" in indoor herds.
- Modern Varition: Recent experiments have used white noise and nature sounds, though melodic music remains the most consistent performer.
- Economic Impact: For a large-scale dairy operation, a 3% increase in yield across a thousand cows represents a significant increase in annual revenue with almost zero additional overhead.
Do cows have a favourite genre of music?
No. Research suggests cows respond to the tempo and frequency rather than the genre. Anything under 100 BPM works, whether it is classical, folk, or slow pop.
Does the volume of the music matter?
Yes. Excessive volume acts as a stressor regardless of the tempo. The goal is to mask mechanical noise, not to create a loud environment that prevents the animals from hearing their surroundings.
Is this effect permanent?
The effect lasts as long as the stimulus is provided. Animals can become habituated to a specific playlist, so farmers often rotate tracks to keep the ambient environment effective.
Key Takeaways
- Tempo is Key: Music with a tempo below 100 BPM is the most effective for increasing milk production.
- Stress Reduction: Music works by lowering cortisol and allowing oxytocin to facilitate the milking process.
- 3% Yield Increase: While the percentage seems small, the cumulative effect on large herds is economically significant.
- Acoustic Masking: One of the primary benefits of music is drowning out the harsh, stressful noises of industrial milking machinery.
- Bovine Welfare: Happy, relaxed cows are objectively more productive than stressed ones.
