Duncan (17), from Lammermoor Station at Paerau, won supreme champion fleece with a Romney ewe fleece.
The young stud sheep enthusiast, who entered six fleeces in the show, also helped shear his sheep with elder brother Lachlan and a friend.
Roger Fuller, from Elders Primary Wool, said Duncan's winning entry was a very good character fleece, with good staple length and crimp.
It was also the right weight, which was crucial in a fleece competition and it stood out.
It was good to see breeds like the Romney ''coming back into their own'', Mr Fuller said.
It was also encouraging to see a young person wanting to go farming, he said.
There were more than 100 entries in the fleece competition.
Duncan, who has his own Romney stud, is a third-generation stud breeder on both sides of his family.
His foray into stud breeding began in 2007; he started crutching when he was 10 and began shearing his own sheep last year.