Booroola Sheep Stud at Avenel casually enters a few fleeces into the Australian Fleece Competition at the Bendigo Sheep Show every year but it came as a bit if shock this year when the property won champion commercial fleece.

Farm manager Laurie Bullen said they only entered the show because the fleeces were donated to charity.

"It was a shock when we won champion commercial fleece and we were only point nine off winning the overall championship," Mr Bullen said.

"You never think you are going to win; we just like to support the charities.

The fleece was a 16.6 micron entry with a clean fleece weight of 4.4 kg off an 18-month-old wether.

"It was running on rocky hills, with not much feed. Actually it was on the worst feed I've ever seen," he said.

Booroola is purely a commercial farm and is owned by prominent arts figure Carrillo Gantner.

"We aren't in the game for showing fleeces," Mr Bullen said.

Booroola averages 7.5 kg of 19 micron wool fleece off its ewes and rising lambs.

"We always strive to do better but we are happy with the Rosewood Park blood from Dubbo. It has allowed us to increase micron, increase wool cuts and keep body size up."

Mr Bullen said they would be site sampling more ewes for micron testing into the future to tighten the micron across the flock and would continue to enter fleeces at the Bendigo Sheep Show.