Fairfax Media has spoken to every NSW National in the federal Parliament or their office and found blanket opposition to the state government's plan to shutdown the greyhound industry.

Some Nationals have gone on the record for the first time with their view that NSW Nationals leader Troy Grant and Premier Mike Baird should retreat from their vow to wind up the controversial $350 million industry from July next year.

Nationals leader Barnaby Joyce conceded the political fall-out has leached from state politics into the federal sphere.

"I think you should be very cognisant of the views of the people and I think it's having an effect (federally), yes," he said.

Mr Joyce was quick out of the blocks to support NSW greyhound owners and trainers, as was Riverina MP Michael McCormack, who has described Mr Baird's decision as one pitched at "latte-sipping, keyboard warrior, long sock-wearing elitists from the north shore (of Sydney) who live life through rose-coloured glasses and have never been to a greyhound track".

Andrew Gee, whose decision to run for the federal seat of Calare precipitated the looming Orange byelection being viewed as a referendum on the greyhound ban and the leadership of Mr Grant, said he opposes the shut-down.

"I do not support the greyhound racing ban and never have. Barnaby Joyce took this issue to the federal Nationals' partyroom . . . there wasn't a single dissenting voice," he said.

Parkes MP Mark Coulton said: "I'm not in favour of it but I am respectful of the decision they made at state level. It's a big issue and there is a lot of talk locally. I'm not in favour of the ban."

A senior Liberal MP believes the issue is also taking a toll in outer-metropolitan areas where a lot of people are also not enamoured with the ongoing debate over marriage equality.