The couple were in Ireland for a share milking workshop hosted by Macra na Feirme's Land Mobility Service and Teagasc in Portlaoise, Co Laois.
The event was attended by around 30 farmers interested in share milking, which is now permitted in the post-quota era.
The Tullys explained their path to land ownership in New Zealand, from moving to the country with nothing in 1988 to managing farms. They have now acquired a 30% equity partnership on a farm in Ngatea in the north island and currently own 310 cows.
They told farmers at the event that sharemilking is not easy and agreements must "deliver for all". However, some arrangements can be hugely rewarding for both parties and provides young farmers with a step on the ladder.
Speaking to the Irish Farmers Journal, Ciarán and Sarah discuss the benefits and challenges of share milking with Teagasc's Paidi Kelly.
What is share milking?
Ideal share milker farm
Ideal share milker profile
Information provided by Macra na Feirme's Land Mobility Service