Mulesing - surgically removing skin around the breech of merino sheep to prevent flystrike - is a painful procedure, and the development and adoption of alternatives is a significant animal welfare progress story.
Mulesing welfare requires balancing the acute harm of the procedure against the chronic welfare threat of flystrike. Flystrike - fly larvae feeding on living tissue - causes severe suffering and death. Mulesing as traditionally practised without pain relief causes significant acute suffering. The welfare-optimal path forward is developing and adopting non-mulesing alternatives that prevent flystrike without requiring a painful procedure. These include selecting for low-wrinkle and breech-cover genetics, chemical prevention protocols, and management practices that reduce flystrike risk. Pain relief administered at mulesing is now recommended in Australia even as alternatives are developed. Consumer demand for non-mulesed wool has driven industry change.