Two cattle owners and two groomers were excluded from the Royal Queensland Show for injecting an unknown substance into their cows' udders to make them larger.
In Australia's competitive agricultural shows, dairy cows are judged on the size and shape of their udders, as well as their general appearance.
Some farmers are also suspected of gluing their cows' teats shut, to stop milk leakage.
The four offenders, and their cows, have been sent home in disgrace.
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