"If there is any disruption to the beef trade between the US and China, then that beef has to go somewhere else, it'll either end up on the domestic market in the US which will mean a surplus of beef that could drive down prices - or the US could divert that beef into markets where we're currently enjoying very good returns."
Soy was included in the first round of tariffs which could cause issues for New Zealand says Petersen.
A reduction in soy exported to China could result in a global surplus of cheap feed and this would be hard for New Zealand's grass-fed products to compete with.
"Cheap feed, I always say, is the enemy of New Zealand grass-fed production."
Also in today's interview - Mike Petersen takes a look at how the trade war is affecting global financial markets and President Donald Trump's effect on the World Trade Organisation.
Listen below: