It is estimated there are about 3800 migrant workers on New Zealand dairy farms.
Labour plans to cut immigration by between 20,000 and 30,000 migrants a year.
Federated Farmers Mid Canterbury Chairman Michael Salvesen said migrant workers were important to all sectors of farming, specifically Canterbury dairy farms, where he called the current labour shortages "critical".
He said there were simply not enough New Zealanders to do the jobs.
"Particularly in Canterbury, rural unemployment is actually really low, so we need outside people."
Salvesen said in the regions that did have enough New Zealanders, many did not want to work on farms.
He said rural communities benefited from migrant workers bringing their families to New Zealand, which brought diversification to the region.
"There’s kids from all over the world in Ashburton schools. A lot of these people have really been adding to the whole community."
Watch or read more from Michael Salvesen here: