Sheep Welfare in Wool Production Science 2025

Overview: Approximately 1 billion sheep are farmed globally, with around 500 million primarily for wool production. The wool industry's welfare challenges include shearing stress, mulesing (surgical wound prevention), blowfly strike prevention, and the welfare of sheep at end of productive life. Scientific evidence has advanced substantially on these topics, enabling evidence-based welfare improvements.

Shearing Welfare

Annual shearing is necessary for domesticated Merino and other wool breeds (which have lost natural wool shedding ability). Shearing welfare depends critically on shearer skill, equipment, and handling:

Cuts and skin injuries: Inexperienced shearers cause more wounds; skilled shearers minimize injuries
Restraint stress: Shearing requires physical restraint causing acute stress; duration and technique affect stress intensity
Post-shearing thermal stress: Newly shorn sheep are vulnerable to hypothermia in cold weather; shelter provision post-shearing is welfare-critical
Handling: Rough handling during mustering, drafting, and shearing causes acute fear responses and potential injury

Shearing Context: Australia: ~350 million sheep shorn annually; shearing season duration critical for welfare; shearer skill levels vary widely; welfare-trained shearers increasingly standard in premium supply chains

Mulesing: The Welfare Dilemma

Mulesing is a surgical procedure performed on Merino lambs — removing folds of skin around the breech to create a smooth scar that prevents blowfly strike (myiasis). The welfare trade-off:

Mulesing Welfare Harm

Mulesing without analgesia causes significant acute pain and a wound healing period of 3-6 weeks. Scientific evidence documents elevated pain indicators, reduced movement, and social withdrawal post-procedure without pain relief. It is performed on approximately 30 million lambs annually in Australia.

Flystrike Welfare Harm

Blowfly strike — where flies lay eggs in moist wool folds and larvae eat living tissue — causes severe, prolonged pain and, if untreated, death. Mulesing was developed to reduce this welfare catastrophe in the Australian high-density Merino system.

Scientific Position: RSPCA Australia and most welfare scientists support: mandatory pain relief for mulesing (reducing acute welfare harm); investment in development of flystrike-resistant genetics to phase out mulesing long-term; and alternative prevention methods (targeted selective treatment, crutching frequency) as interim measures.

Alternatives to Mulesing

Active research and industry investment has produced alternatives with varying welfare profiles:

Genetic selection: Breeding for plain-bodied (fewer skin folds) Merino through programs like Sheep CRC has produced commercially viable flystrike-resistant sheep; adoption increasing
Sheep Breeding Values: Selection against breech wrinkle score reduces flystrike susceptibility over generations
Chemical alternatives: Breech clips, liquid nitrogen, Tightskin alternative approaches offer varying effectiveness
Pain relief for mulesing: Meloxicam and local anaesthesia significantly reduce acute pain; increasingly required by wool certification programs

Industry Certification and Reform

The Responsible Wool Standard (RWS) and ZQ Merino certification require pain relief for mulesing and set higher welfare standards for shearing and handling. Major fashion brands including Patagonia, H&M, and others have adopted RWS or ZQ sourcing requirements, driving welfare improvements through supply chain pressure.