There are no infected properties in the Whanganui region, but there are properties that may have had stock that have been in contact with animals on or near infected properties.
There may be more of those in future, Cranstone said.
M. bovis can affect both beef and dairy cattle. The animals most at risk are lactating cows and young calves, and beef calves reared in the dairy industry - because they get moved around a lot.
The speakers at the seminar will be John Pickering from Wanganui Veterinary Services, Rob Brazendale from DairyNZ and Paul McCauley from Beef + Lamb NZ, who has worked in biosecurity liaison in Southland where the disease is rife.
Representatives of NAIT and rural support trusts will also be present.
The seminar is an effort by Federated Farmers' new executive to provide value for its members and others.