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WALTHAM is a leading scientific authority on the nutrition and health of companion animals. The WALTHAM Equine Studies Group, which is headed by Professor Pat Harris MA PhD,VetMB DipECVCN MRCVS, is dedicated to advancing the science of horse nutrition and provides the scientific support for the SPILLERS brand. By collaborating with key research institutes and universities around the world its work remains at the forefront of equine nutritional science. Visit the WALTHAM website to find out more.


  • Meet the head of the Equine Studies Group and Director of Science at SPILLERS

    Pat HarrisPat has been interested in horses from an early age and currently has 2 of her own. In the past she represented the Pony Club in various regional activities in the UK and in a number of student riding competitions throughout Europe. She also obtained her Half Blue for riding whilst at University. Since qualifying as a Veterinary Surgeon, Pat has also been involved in the Veterinary care of horses at several three-day events, and currently serves on the BEF’s World Class performance’s Scientific Advisory Board as well as the Veterinary Advisory Committee of World Horse Welfare.

    After qualifying from the University of Cambridge Veterinary School in 1983, Dr. Pat Harris completed her PhD at the Animal Health Trust in Newmarket into the Equine Rhabdomyolysis Syndrome. She joined the WALTHAM Centre for Pet Nutrition in 1995 and is responsible for the research carried out by the WALTHAM Equine Studies group in collaboration with experts at institutes and universities around the world. This research provides the science behind the SPILLERS brand. She is also an Adjunct Professor of Equine Studies at Virginia Polytechnic Institute and State University, an Honorary Research Fellow at the University of Liverpool, an Honorary Professor in Equine Nutrition, University of Nottingham, School of Veterinary Medicine and Science, and an Adjunct Professor at University of Queensland Australia.

    Dr. Harris is a European Specialist in Veterinary Clinical and Comparative Nutrition, in addition to being a Past President of the British Equine Veterinary Association. She is also a member of the board of American Academy of Veterinary Nutrition and the US based equine Science Society as well as the Vice president of the European Society of Veterinary and Comparative Nutrition. She is also a member of the Scientific advisory group to the British Equestrian Federation’s World Class Performance team. She is the author or co-author of over 500 scientific papers, abstracts and book chapters and recently was the co-editor of, and an author in, the 2013 textbook Equine Applied and Clinical Nutrition: Health, Welfare and Nutrition. She was also a co-author of the two nutrition chapters in the revised 2014 Equine Sports Medicine & Surgery textbook.

  • Meet our Research and Development Manager

    Clare Barfoot BSc (Hons) RNutr

    Clare BarfootClare graduated with a degree in Animal Science from The University of Newcastle upon Tyne having always shown a passion for animals but particularly horses. Horses and ponies have always played a central role in Clare’s life after being born into a horse mad family. Through Pony Club and beyond Clare has tried her hand sometimes successfully, sometimes not at most equestrian disciplines. Nowadays Clare’s riding endeavours are restricted to schooling and hacking on her Welsh Section D mare Missy (aka the pocket rocket!) who she backed and brought on herself.

    Clare started her career as a pig and poultry nutritionist where she learnt to formulate and design nutritional products before moving to SPILLERS which enabled her to combine her passion for horses and nutrition. Clare is a registered equine nutritionist with the Association of Nutrition and today has a pivotal role in developing our feeds, looking after all our iconic recipes, overseeing our care-line and working very closely with Dr. Pat Harris to steer our extensive research program where she has co-authored numerous peer-reviewed papers on equine nutrition and management. With a particular interest in laminitis Clare sits on the WALTHAM International Laminitis and Obesity symposium where her role is to translate the science from our research into practical advice for horse owners and into product innovation so our products remain at the forefront of nutritional thinking.

    As well as Clare’s role for SPILLERS she sits on the British Equestrian Trade Association’s Feed Committee to ensure the needs of the industry are represented at national level, she is also sits on the British Horse Society’s Nutrition Advisory Group helping to improve nutritional education for horse owners, grooms and instructors.