Swiss cowbells can hit 113 decibels near a cow’s ear, study finds

A study involving 96 Brown Swiss cows has measured just how loud the bells worn across Alpine pastures can get, comparing animals that regularly wore bells with those that had little or no exposure to them. The research found that cowbells worn on Alpine pastures can produce sound levels ranging from around 90 to 113 decibels close to an animal’s ears.

The researchers were investigating how the cows reacted to controlled sound stimuli and whether long-term exposure to bells altered those responses. Cows accustomed to wearing bells tended to show reduced avoidance reactions to certain sound stimuli compared with cows that had little experience wearing them, suggesting a degree of habituation to the noise. Importantly, the findings did not provide evidence of severe hearing impairment among the animals tested.

That the bells are loud is, in a sense, the point. Cowbells have long been used as a practical way of tracking freely roaming cattle across Alpine regions, where visibility can shift quickly and herds often graze far from any settlement. Long before they became a symbol on postcards and souvenir shelves, the bells let a farmer locate animals scattered across extensive, hard-to-see mountain terrain.

That practical role gradually merged with local custom. In many Alpine communities, cattle are driven up to high pastures at the start of summer and brought back down when the season ends — a return marked, per the University of Georgia, by festivals known as ‘Alpabzug’ in Switzerland, with counterparts in Austria and Germany. During these events cattle are decorated with flowers and elaborate headpieces, and fitted with decorative bells that are often larger and more ornate than the ones used for everyday grazing, reflecting craftsmanship and regional identity rather than agricultural need.

Even with GPS collars and electronic tracking now available, bells remain part of Alpine farming because they require no charging and keep working when batteries fail or terrain blocks a signal. The sound-exposure study suggests the animals themselves adapt to the noise over time, even as the tradition of hanging bells on cattle continues largely unchanged from its original, practical purpose.

Image: Wikimedia Commons/by Matias Senger