20 September 1931 – 7 May 2026

The World’s Poultry Science Association (WPSA) mourns the passing of Dr. Ian Ramsay Sibbald, who died on 7 May 2026 at the age of 94.

Dr. Sibbald was one of the world’s most influential poultry nutritionists. Born in England, he graduated in Agriculture from the University of Leeds before emigrating to Canada, where he obtained his MSc and PhD at the University of Alberta and went on to build a distinguished career as a research scientist with Agriculture Canada.

His name became synonymous with the development of the True Metabolizable Energy (TME) bioassay, a landmark achievement that transformed the evaluation of feed ingredients for poultry. The TME system provided a far more accurate assessment of the energy value of feedstuffs than previous methods and became an international standard for poultry nutrition research and feed formulation. He subsequently extended the principles of the assay to the evaluation of amino acids, lipids and minerals, leaving a lasting impact on both science and commercial poultry production. During his career, he authored more than 140 scientific papers and received numerous honours for his research achievements.

Dr. Sibbald was a long-standing member and supporter of the World’s Poultry Science Association. His scientific excellence and worldwide influence were recognised in 1988, when he was inducted into the International Poultry Hall of Fame, one of WPSA’s highest honours, in recognition of his outstanding international contributions to poultry science and the global poultry industry.

Beyond his scientific accomplishments, colleagues knew Ian as a rigorous and original thinker who was never afraid to question accepted concepts. His work was characterised by precision, intellectual curiosity and a commitment to linking fundamental research with practical applications. He willingly shared his expertise with fellow scientists and inspired generations of researchers in poultry nutrition.

Dr. Sibbald’s legacy lives on through the countless researchers and nutritionists who continue to build on his work. His contributions have improved the efficiency and sustainability of poultry production around the world and remain fundamental to modern poultry nutrition.

The World’s Poultry Science Association extends its sincere condolences to Dr. Sibbald’s family, friends and former colleagues. He will be remembered with great respect and gratitude as an outstanding scientist whose work profoundly advanced poultry science and whose influence will continue for generations to come.