An animal welfare group has called for an inquiry into the horse racing industry, saying like greyhound racing, thousands of animals are killed because they are deemed uncompetitive.

The Coalition for the Protection of Racehorses (CPR) says about 10,000 racehorses are retired each year but there is no way to track what happens to them.

Each year, about 4,000 foals bred for racing never compete and more than 3,000 mares are retired from breeding.

"Take away the live-baiting and horseracing has exactly the same animal welfare issues greyhound racing has," CPR campaign director Elio Celotto said in a statement.

"It's time for governments in each state to take affirmative action because, like greyhound racing, they've shown themselves incapable of self-regulation."

On Friday NSW Premier Mike Baird announced greyhound racing would be banned in the state from July 1 next year. The ACT quickly followed suit.

NSW opposition leader Luke Foley has also drawn parallels between the two industries while calling for greyhound racing to be allowed to remain in the state.

Mr Foley said former High Court judge Michael McHugh, who oversaw the special commission into the greyhound racing industry, has given recommendations including monitoring the entire life of a greyhound as an alternative to closing down the sport.

"I think the brutal truth ... when it comes to so-called wastage is if that is the catalyst to close down greyhound racing, we would also have to close down thoroughbred horse racing and close down the beef industry," Mr Foley told ABC Radio today.

"Wastage does occur. Is it repulsive? Yes it is. Should we do something about it? Yes we should and I think (Commissioner) McHugh provides as an alternative to declaring the industry illegal a road map that would involve far more monitoring and reportage on the life cycle of greyhounds."

Last week Tony Gannon from Greyhound Breeders, Owners and Trainers Association said the cruelty of horse racing had been ignored in the NSW decision.

The group plans to fight the decision to ban the sport.

"Where do these racehorses all go? [In to] our dog's tummy, we feed off horses," Mr Gannon said.

ABC/AAP