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Mr Thompson's Limousin steer won both the on the hoof and on the hook sections of the annual competition, which attracted 30 entries.
Convener Barry Gray said entries were down on recent years, which could possibly be attributed to a good season with cattle being killed earlier.
Mr Thompson won the Alan Dodd Trophy for the champion carcass and also the Doug Lindsay Memorial Trophy for champion on the hoof.
The standard was very high and some ''long-term'' competitors tended to come to the fore, Mr Gray said.
William Mitchell judged the entries on the hoof at the Charlton Saleyards, while Neil Willis and Mervyn Wilson judged them on the hook component at Alliance Group's Mataura plant.