A University of Pretoria (UP) study has shown that playing soothing classical music to dairy cows lowers their stress levels and increases their milk production. The findings, which were published in the journal Domestic Animal Endocrinology, are the result of research by Lize-Mari Erasmus, a former member of UP’s Camerata choir, who has a Master of Science (MSc) degree in Agriculture (Animal Science) cum laude from the University.
Erasmus’s MSc studies allowed her to combine her two passions: music and animals. Before embarking on a career in animal sciences, she had obtained a Bachelor of Music degree at UP, with Choral Conducting as one of her majors.
Hers is the first study of its kind in South Africa to investigate the influence of classical music on the stress levels and milk production of cows.
“The health and welfare of dairy cows go hand in hand with efficient and sustainable dairy production,” she says about the value of providing farm animals with enriching environments.
The World Organisation for Animal Health (OIE) describes animal welfare as a human responsibility, and includes all aspects of animal life, including proper management, housing, disease prevention and treatment, humane handling and responsible care.
“Providing cows with an enriching, stimulating environment, such as through music, is one way of improving their living conditions and, in the process, looking after their mental needs too,” Erasmus says.
In order to oversee the experimental phase of her project, Erasmus spent four months at Innovation Africa @UP's Future Africa Institute, where a herd of Holstein cows are kept.
“Not many studies have been conducted within the setting of a commercial dairy farm such as the one at Future Africa,” she notes.
Nine Holstein cows were divided into three groups of three, and over the course of four months, each group was exposed to three treatments. One group of animals was exposed to classical music every day for 24 hours wherever they were on the farm; another group wasn’t exposed to any music at all; and in the third group, the cows heard classical music only when they were being milked.
Erasmus says she could sense from their slightly agitated behaviour that the cows that were exposed to music needed time to adapt to their “new normal”, which they did within two weeks.
She included works from well-known composers such as Wolfgang Amadeus Mozart, Edvard Grieg, Arcangelo Corelli and Jacques Offenbach, as well as compositions such as Ludwig van Beethoven’s Moonlight Sonata, Camille Saint-Saëns’s The Carnival of the Animals and George Frideric Handel’s Water Music. It was played over a speaker system on shuffle mode to ensure that the animals did not learn to associate a particular sequence of music with a particular part of the day, such as milking time.
About her choice of slower pieces of classical music, Erasmus says: “Previous research has found that dairy cows prefer slow music to fast-paced music, and instrumental music such as the classics rather than rock or Latin music.”
In order to determine the stress levels of the cows, and with the help of UP’s Endocrine Research Laboratory, she regularly tested how much glucocorticoid (a hormone that is produced in stressful situations) was found in the dung and milk of the animals in the different treatment groups.
“Cows exposed to constant music had the lowest stress-related levels of glucocorticoid in their dung,” she explains. “They were noticeably calmer when being milked, which is generally a stressful time of the day because of all the activity.”
Up to two litres more milk per milking session were obtained from the cows when they were constantly surrounded by music all day and night.
“The findings indicate that auditory stimuli as a form of environmental enrichment have economic benefits to the producer,” Erasmus says. “It could mean that milk producers might be able to keep fewer cows, yet still be profitable. I believe consumers will respond positively if they know that the milk they use comes from cows who are kept on a farm where environmental enrichment of the animals’ surroundings is a matter of priority.”
Erasmus’ research was supervised by Professor Esté van Marle-Köster, Head of the Department of Animal Science at UP, with Prof André Ganswindt, Director of the Mammal Research Institute in UP’s Department of Zoology and Entomology, as co-supervisor.
“Prof Van Marle-Köster loves classical music too, and was immediately interested when I first presented her with the idea of studying the influence of classical music as a way of improving the welfare of cows,” Erasmus says.
Click on the gallery in the sidebar to see some of the behind the scenes moments of this study.
Lize Erasmus, Prof Este van Marle-Koster and Prof André Ganswindt
March 15, 2023
Animal welfare researcher Lize Erasmus completed two undergraduate degrees, BMus and BSc (Agric), at the University of Pretoria (UP), and has been doing research at UP for the past four years.
“UP prioritises research, and has state-of-the-art facilities and award-winning researchers who are at the top of their respective fields,” she says.
Her PhD research will focus on livestock genetics. She believes her research will contribute to the betterment of the world because there is a global move towards improving the living conditions of livestock. Erasmus’s field of research will allow for enhanced animal welfare without the need for drastic alterations or incurring expenses.
“Improved animal welfare will not only better the lives of animals, but will also promote a more positive image of livestock production, improve the quality of produce and assist sustainability endeavours,” she explains.
Her academic role model is her MSc supervisor, Professor Este van Marle-Köster, who Erasmus says is an award-winning researcher and “a fantastic lecturer”. Prof Van Marle-Köster is a pioneer in the field of animal breeding and genetics. “She has a heart aimed at helping both humans and animals,” Erasmus says.
Her advice to school learners or undergraduates who are interested in her field is to believe in themselves and their mission. “There will always be people who tell you it can’t be done, but the world needs innovators and risk takers,” she says.
Erasmus loves outdoor activities such as hiking, running and kayaking, but will never say no to a good book on a rainy day.
Professor Esté van Marle-Köster graduated with a degree in Animal Science from the University of Pretoria (UP) in 1986. She also holds an honours in Animal Science and an MSc (Agric), having conducted her postgraduate studies part-time while working full-time in the industry.
Prof Van Marle-Köster returned to UP to do her PhD, and joined the University as a lecturer in July 1995. She has been doing research at UP for the past 27 years.
“I’ve always believed that I joined the best Animal Science Department in South Africa when I came back to UP,” she says. “I was given the opportunity to do the first molecular genetics work applied to livestock as an animal scientist. Our department was the first in the country to teach a module in applied molecular genetics. We hosted the first livestock genomic workshop in South Africa, which led to the establishment of a genomic livestock consortium for beef cattle.” It also led to the SA Beef genomic programme (BGP), where Prof Van Marle-Köster coordinated the research committee.
Animal science is all about responsible and sustainable food production, she says. In her research, Prof Van Marle-Köster focuses on traits related not only to production, but to the welfare of animals too. Sound animal husbandry results in longevity in animals and increases the overall efficiency of the system, she adds; it also improves sustainability.
“I am interested in what we refer to as ‘new’ traits/phenomes. They are not really new, but difficult to measure, so we are searching for new ways to measure. For example, we search for ways to measure claw traits in dairy cattle, which is difficult to do, but if we could measure using precision livestock farming techniques, I can have access to large datasets to apply in research. That way, we can select cattle with ‘good’ claws and manage the environment of these cows for improved claw quality.”
As to how her research contributes to the betterment of the world, she says: “The answer to a better world with regard to livestock production and feeding the human population lies in multidisciplinary projects, where we can share resources and find solutions to improve the whole value chain.”
Within her department, she leads applied genetic research in beef and dairy cattle. She is project leader for the African Genomics Project, for which she and her research team are collaborating with the Ludwig Maximilian University of Munich and Queen Mary University of London to sequence local beef cattle genomes. The aim is to investigate underlying genetic mechanisms for adaption in these breeds.
In terms of cross-faculty research at UP, she is collaborating with Prof André Ganswindt, Director of UP’s Mammal Research Institute (MRI), on studies about animal behaviour and physiology. Prof Van Marle-Köster is also involved in the PLF project with Prof Herman Myburgh of the Department of Electrical Engineering; this project aims to automate body condition scoring and detect lameness in dairy cows.
Her latest project is to do with monitoring the behaviour and water intake of commercial feedlot cattle, and measuring their stress. This is another collaboration with Prof Ganswindt and the MRI.
Prof Van Marle-Köster’s father was also an animal scientist, who inspired her to think beyond the “basic science” to see that what is done in livestock production has consequences.
“You cannot do animal science in isolation,” she says. “Our research will contribute only if there is context.”
She hopes to inspire young animal scientists with her research, which matters, she says, because it provides a good base for postgraduate students and will hopefully lead to more opportunities for them. Her advice to school learners or undergraduates who are interested in her field is to read widely for a better understanding of the world before narrowing their interests down.
In her spare time, Prof Van Marle-Köster enjoys listening to music, reading and going for long walks.
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