SYDNEY - Black Caviar's younger brother has lost his battle with illness after two months of intensive care at a Victorian veterinary clinic.
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The $5 million colt, at the centre of the collapse of BC3 Thoroughbreds, was euthanised on Sunday morning at the Werribee clinic.
Mark Webster, managing director of auction house William Inglis and Son which held security over the half brother to the champion mare, made the announcement on his blog.
"At approximately 11am this morning the Redoute's Choice x Helsinge two-year-old colt known as Jimmy was euthanised on humane grounds at the Melbourne University Veterinary Hospital in Werribee Victoria," Webster said.
"Jimmy was suffering from laminitis, a painful hoof condition that impacts on the mobility of horses."
The colt is believed to have developed laminitis after suffering an adverse reaction to antibiotics being used to treat a swollen leg, apparently caused by a spider bite.
BC3 signed for an Australian record $5 million at the Easter Sale but defaulted on payment of the colt.
At the 2012 Easter sale, BC3 bought Black Caviar's younger half sister Belle Couture for $2.6 million.
BC3 no longer has an interest in the Danny O'Brien-trained filly which ran second on debut last week at Bendigo.
Another half brother to the champion mare, All Too Hard, has just finished his first season at stud. - AAP