The "Bunny Boy" would call up greyhound keeper Sherrie Turner every few months to ask if she needed more "parcels" delivered.

"Parcels" was their code for the rabbits Ms Turner sold as live baits to greyhound owners and trainers.

"What people do in their own backyards with their own dogs was not for me to pass judgment on," Ms Turner told the NSW Special Commission of Inquiry into greyhound racing on Tuesday.

Ms Turner said a man named Greg Hughes, the Bunny Boy, would trap rabbits in the bush around Goulburn and drop them round to Ms Turner's home in south-west Sydney.

Her husband would wring the necks of some, wrap them in cling wrap and put them in the freezer. The others faced the worse fate of being mauled alive.

Ms Turner would ring up two trainers, known for legal reasons as Ms Y and Mr S, to tell them their parcels had arrived and they had better come over "straight away".

Selling live baits, she told the commission in a previous hearing, was not a good look.

Todd Fear, a western Sydney trainer, admitted to using live baits on about 15 occasions between 2012 and late last year at three separate training grounds near the Richmond and Londonderry areas. He said it was in the hope the dogs would "chase a bit faster".

Commissioner Michael McHugh, QC, asked Mr Fear if he had done time trials to check his dogs ran faster after livebaiting.

Mr Fear had not.

Counsel assisting the inquiry, Stephen Rushton, SC, asked the trainer how common livebaiting was.

"Well, yeah, I don't know," Mr Fear replied. He was read evidence he gave at a previous, private hearing in which he described the practice as "rampant".

Another trainer, Adam Wallace, admitted to livebaiting his dogs, which he called "education". Wayne Smith, a friend of Mr Wallace's, said he had "blooded" dogs as young as three months in the hope they would chase faster.

"Dogs don't eat the rabbits," he said. They lose interest after the kill.

The three men each said they expected 90 per cent of trainers in NSW had used livebaiting until the practice was exposed by the ABC's Four Corners program in February. A female trainer who live baited, Majella Ferguson, called the practice "extremely widespread".

The inquiry heard on Monday the industry's regulator, Greyhound Racing NSW, had known about livebaiting but kept it secret and did nothing to stamp it out.

Mr Rushton also read from a confidential memo by the Australian body Greyhounds Australasia this year, which estimated 13,000 to 17,000 greyhounds were killed in the country each year. Mr Rushton said he had seen no evidence to suggest the industry should not be banned.