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The grand champion goat from this year's Colorado State Fair has been disqualified after testing positive for an unapproved feed additive.

Margaret Weinroth, who raised Theodore the goat, will not receive its $5,500 (£3,500) sale price and is barred from future livestock events at the fair.

A second goat raised by the Weinroth family also tested positive for the additive, ractopamine.

They denied any wrongdoing and said their feed may have been tampered with.

Tests carried out on Theodore's urine revealed traces of ractopamine, a muscle growth additive approved by the federal government for use by swine but not goats.   More Read