The devastating drought and backlash from an ABC 7.30 report will lead to excess horses being euthanised after Friday's equine auction in Echuca.

The biggest horse saleyard in Australia is anticipating more than 200 horses of all breeds to be up for sale on Friday, with truckloads arriving from Queensland and NSW due to the drought and horses having no water to live off.

Less than 10 per cent of the horses for sale are expected to be thoroughbreds, with the majority quarter horses, paint horses and Clydesdales.

The devastating effects from the drought will result some horses being euthanised. Credit:Jenny Evans

Auctioneer Andrew Wilson, who runs the fortnightly Echuca sale, said some of the horses would be left without a home after Friday, and the only option would be to humanely euthanise them at the cost of owners and farmers.