The Scanlon family's Quailerup West stud achieved something that Geelong Cats couldn't achieve on the weekend when it took home this year's Perth Royal Show supreme cup to make it back to back Merino premierships.

The supreme title had eluded the Arthur River-based stud for many years but that finally changed last year when they won the award after coming close a number of times.

Then on Sunday afternoon they achieved the feat again with a big upstanding Merino ram.

Before the heavyweight ram earned the right to compete for the broad purple supreme ribbon, he had to overcome Peepingee's grand champion Merino ewe, Kolindale's grand champion Poll Merino ram, Belmont Park's grand champion Poll Merino ewe and Eastville Park's junior and grand champion autumn-shorn ram.

And, in similar fashion to the AFL grand final, the judging wasn't all one sided with each exhibit well and truly putting its case forward.

In the end the judges awarded the enormous, deep-bodied, strong wool ram the supreme ribbon.

The ram was started on its winning way when it was put into the number one position by strong wool judge Paul Norrish, Angenup stud, Kojonup, when it entered the ring for the strong wool class.

From here it was sashed the champion strong wool Merino ram and grand champion Merino ram in a unanimous decision.

Mr Norrish said the ram was an outstanding sire with a magnificent head and bone structure.