Johan G. ("Boet") Bekker obtained a BSc (Agric) degree at the University of Stellenbosch in 1922 and his BVSc at the Veterinary Faculty of the University of Pretoria at Onderstepoort in 1925. He saw service at Onderstepoort and at Armoedsvlakte where he developed a special interest in mineral metabolism and especially the role of phosphate in the nutrition and health of livestock, which was also the subject of his DVSc thesis, On the administration of phosphorus to animals through their water supply (1931). His thesis project was published in the 18th Report of the Director of Veterinary Services and Animal Industry (1932).
After a spell in private practice in Pretoria Bekker went overseas in 1930 to study problems related to wool production under professor Barker of Leeds University and Dr Crew at Edinburgh. On his return to Onderstepoort he was appointed as head of the newly established wool research unit, where he served until his death in 1960. His work was published in about a dozen papers. He was married to Maria Catharina Smith, with whom he had two children.