By Teagasc Green Acres Calf to Beef Programme advisor Seán Cummins With the development of antimicrobial resistance, there’s an increased focus on the way in which antibiotics are being used in both human and animal health. Peter and Thomas O’Hanrahan, participants in the Teagasc Green Acres Calf-to-Beef Programme, have recorded a significant reduction in the quantity of antibiotics being used on their farm on the outskirts of Thomastown, Co. Kilkenny. Expressed on a milligram per kilogram of liveweight output basis, the O’Hanrahans used 6.4mg/kg of liveweight output in 2020, down from 57.5mg/kg of liveweight output in 2018 – a reduction of 89%.