The most popular fine wool sheep breed of the world is –

📝 Key Points
→ As compared to human hair, which is 50 to 70 microns in diameter, Merino breed wool is less than 24 microns in diameter, making it the finest wool in the world.
→ Merino Sheep, native to Spain, is considered an exotic breed and adapts well to semi-arid climates.
→ Merino Sheep have a large number of skin folds.
→ Australian Merino sheep wool is the world’s finest and softest wool.

📌 Additional Information
🐑 Lincoln Sheep
→ Native to England.
→ Also called Lincoln Longwool.
→ They produce the heaviest, longest, and most lustrous fleece in the world.

🐏 Corriedale Sheep
→ Native to New Zealand.
→ A crossbreed of Merino and Lincoln.
→ They are hornless (polled) and a dual-purpose breed (wool and meat).

🐑 Rambouillet Sheep
→ Native to France.
→ Also called Rambouillet Merino or French Merino.
→ They are a dual-purpose breed (wool and meat).