The Department of Primary Industries says it doesn't plan to mandate Hendra vaccines but will develop a policy on how to handle the virus at major horse events.

Yesterday in Tamworth, vets from the DPI met with industry groups for the first time in NSW since the vaccination has been introduced.

The manufacturers of the vaccine also joined the vets, to field questions from industry groups about what this'll mean for biosecurity measures at events.

New South Wales chief veterinary officer Ian Roth says they made a lot of progress at the forum, but he'll have to go away and continue to look at the issue.

"The question was certainly raised of how industry should handle the vaccination," he said.

"One of the big questions was what would we do in the event of a suspect case of hendra in an big event, or worse still if you had confirmed case of hendra, because obviously there's human problems as well as those with the horses."

Organisations that attended the forum included the Stock Horse Association, the Quarter Horse Association, the Cutting Horse Association, the Bushmen's Campdraft and Rodeo Association, the Paint Horse Association and the Appaloosa Association.

Dr Roth says while there are already policies on how to deal with Hendra, there needs to be more discussion on how this may affect major events.

"In situations where you've got so many horses and so many people, we probably do need to think about how we can be more precise in how we deal with horses being vaccinated," he said.

"Biosecurity is a shared responsibility, and this was a really good example of getting the perspective of industry, government, the vaccine manufacturers and private vets on how we deal with it.

"If every horse is vaccinated that comes here, that certainly dramatically lessens the risk. We've got some policy questions to go away with and think about on how to deal with a situation where some, not all horses, are vaccinated."

Dr Roth says NSW DPI isn't going to mandate vaccinations.

"Certainly industry, in coming to major events, can look at it," he said.

"More so, I think the question for us is do we allow vaccinated horses to go home after an event and that comes back to looking at the whole situation. But we're going to put a written policy out on that in probably about a month."