Long-time International Dairy Week (IDW) exhibitor Bushlea Jerseys took the supreme grand champion interbreed award on Thursday.
The young cow Bushlea Van Fernleaf 10 also won the Jersey cow, four years, in milk class before taking the best udder, senior champion and grand champion awards.
It was Bushlea's first interbreed supreme award at either IDW or Royal Melbourne where it exhibited for many years.
Owner Wayne Kuhne said the Fernleaf family was one of the stud's most prominent and had been a foundation family in the herd when it was established in 1945.
But this was the first Fernleaf to take a grand champion award.
Mr Kuhne said the cow, which had already produced three calves and was again in calf, produced a lot of milk.
Last lactation it produced more than 7500 litres, which was above the herd average of 7000 litres (600 kilograms of milk solids).
The Kuhne family milks 400 cows at Koonwarra, Vic.
They aimed to breed high-quality Jersey cows that were profitable.
"Jerseys are easy to work with; they are more profitable when you look at feed conversion and the amount they eat," Mr Kuhne said.
The reserve intermediate interbreed champion was the Holstein champion Paringa Braxton Parry, exhibited by the Barron family and Elm Banks Holsteins, Crossley, Vic.