A device is being developed to allow a farmer to take a breath sample from a cow that can read whether the animal is pregnant or not.

A feisty four-year-old cow stole the show at the Victorian Winter Fair on Thursday, taking the supreme senior champion award ahead of older cows in the event.

Results and photo gallery from the Victorian Winter Fair senior show preliminary classes.

A young cow that was pulled from the ring at last year's Victorian Winter Fair made a triumphant return this year claiming the intermediate championship.

Results and photo gallery from the Victorian Winter Fair intermediate show preliminary classes.

A heifer exhibited by Brad and Jess Gavenlock won the junior championship at the Victorian Winter Fair on Wednesday.

Results and photo gallery from the Victorian Winter Fair junior show preliminary classes.

Results and a photo gallery from the Victorian Winter Fair junior handling classes.

The legendary Australian Holstein Sire Medallion - Bundalong Marks Medallion VG86 - died in late June just short of its 14th birthday.

The Victorian Winter Fair kicked off on Tuesday at the Prince of Wales Showground in Bendigo with the junior judging competition.