Sheep Breed · Spain (now central to Australian wool farming)
Merino
The world's premier fine-wool sheep — soft, dense fleece on a hardy rangeland frame.
By the WARN Research & Conservation TeamChecked against IUCN Red List & CITES sourcesLast updated
In brief
The Merino is the world's most important fine-wool breed, originally from Spain and now central to Australian wool production. Prized for soft, dense fleece, it is hardy and well adapted to dry rangeland — but skin folds bred for extra wool drive the welfare problem of flystrike and mulesing.
Merino: At a Glance
| Origin | Spain (now central to Australian wool farming) |
|---|---|
| Size | Medium (ewes 45–80 kg; rams 70–125 kg) |
| Typical weight | Ewes 45–80 kg; rams 70–125 kg |
| Lifespan | 10–12 years (commercial ewes culled earlier) |
| Fleece & horns | Very fine, dense white wool; many strains have skin folds; rams often horned |
| Temperament | Hardy, strongly flocking, wool-focused |
| Kept for / notes | Flock keepers & smallholders — sheep are flock animals and must never be kept alone |
History & Origins
Domestic sheep (Ovis aries) were among the first livestock animals, domesticated from wild mouflon in the Fertile Crescent around 10,000 years ago and spread worldwide for wool, meat and milk. Centuries of selective breeding produced hundreds of regional breeds — from fine-wool Merinos to hardy hill breeds and rare heritage types — each shaped by local climate, terrain and farming needs.
Merino Fun Facts
- Merino wool is among the finest of any sheep breed, measured in microns.
- Spain once guarded its Merino flocks so jealously that exporting them was a capital offence.
- Australia now farms tens of millions of Merinos.
- Skin folds that boost fleece weight also raise the risk of flystrike.
Merino Common Health Issues
Conditions seen more often in this breed, and how owners and vets help manage them. This is general guidance, not veterinary advice — always speak to your vet.
Flystrike
Blowflies lay eggs on soiled or wet wool — often around the tail — and the maggots eat into the living flesh, causing rapid, painful and potentially fatal damage, especially in warm months.
Care: Keep the rear end clean (crutching), prevent scouring, check at-risk sheep daily in fly season and treat affected animals urgently with veterinary help; preventive products are available.
Footrot
A contagious bacterial infection of the hoof, common in wet conditions, causing painful lameness, smelly discharge and separation of the horn.
Care: Keep footing dry, trim and inspect hooves regularly, isolate affected animals and treat promptly with veterinary guidance.
Parasitic gastroenteritis (barber's pole worm)
Gut worms — especially Haemonchus contortus, the 'barber's pole worm' — cause anaemia, bottle jaw, weight loss and death, particularly in warm, wet climates.
Care: Use faecal egg counts and targeted, rotational worming rather than blanket dosing; pasture management and the FAMACHA anaemia check help control resistance.
Help animals in need
World Animal Rescue Network funds partner-led rescue, veterinary care and protection programmes across South Asia, Southeast Asia and South America.
