Pam Malcolm brought just one animal to show at International Dairy Week on Thursday but that was enough to take the Holstein supreme champion and interbreed intermediate champion awards.
Ms Malcolm, from Paringa Holsteins, Invergordon, Vic, returned to the show ring after a four-year absence.
She brought just one cow to the show, Paringa Fever Opa, whose three-month-old calf sold at the World Wide Sires Evolution Holstein sale on Wednesday night for $6000.
The cow was prepared by Andrew Cullen and Erin Ferguson for the show.
Ms Malcolm said she was thrilled to win the award.
"I just can't believe it - I am over the moon," she said.
Canadian judge Pierre Boulet, in placing the cow ahead of the senior champion for the top Holstein award, said the three-year-old cow was all quality.
"I like this cow a lot - to build a cow like that at that age," he said.
He also awarded it the Holstein best udder award.
In the earlier judging, Mr Boulet said the cow had a tremendous udder and good feet and legs.
"She's my kind of cow - that's a dairy cow," he said.
Bluechip Genetics, from Zeerust, Vic, dominated in the event - taking the champion senior cow, champion and reserve junior cow and premier breeder and exhibitor awards.
The senior cow was Windy Vale Contender Rose, owned by Bluechip in conjunction with Windy Vale Holsteins and Frank and Diane Zorba, from the United States.
Di Malcolm, from Bluechip, said the win was the stud's first in the senior championship since 2006.
The stud sold a lot of animals so keeping at the top of the competition, particularly at an event like IDW, was always a challenge.
Mr Boulet said the cow was "really stylish and really dairy" with great teat placement and size of teats.
The junior champion, rising two-year-old Bluechip Goldchip Beciee, was described by Mr Boulet as a cow with lots of dairyness.
"She's a very nice heifer, with lots of style and real femininity," he said.
The reserve champion was a six-month-old red heifer, Bluechip Contender Cherrypop-Red, from the youngest class.
