The daughter of Desert Sun, who proved her champion qualities with victories in Australia, Hong Kong and her native New Zealand, humanely destroyed this morning.

The 14-year-old mare succumbed to the serious hoof disease and US expert Ric Redden told connections nothing could be done to save the champ.

"It was Ric's advice that she had lost all quality of life due to the debilitating disease," former trainer and part owner Trevor McKee told NZPA.

"We will miss her terribly. We have taken the only decision available, acting on the best advice that could be obtained worldwide."

"Sunce will forever by a part of Australasian racing folklore and it has been a privilege being associated with such a champion, who we will always consider a part of the family."

Sunline earned over NZ$13 million during an illustrious career in which she won 32 of her 48 starts.

She was three times voted Australia's Horse of the Year - and over four consecutive seasons was crowned the best of New Zealand.