"I think in the rural community, it's a tough time," says Kirwan who encourages farmers to pay more attention to themselves when they feel overwhelmed, and to treat these feelings as a normal part of life.
"It's just a matter of opening up the discussion and just making it normal to have that discussion and realise you've got to get help."
Mackay asks Kirwan why New Zealand has such a high suicide rate.
"I don't think we are open about our emotions. We suppress our emotions. When I was really unwell, crying was failure 'because I got taught - as we all did in our era - to grow up and crying was not something that a man did. That's completely wrong."
Also in today's interview: Sir John Kirwan talks a bit about his experience going public with his depression as an All Black and chats to Mackay about how the footy is going today.
Where to get help:
Rural Support Trust: 0800 787 254
Lifeline: 0800 543 354 (available 24/7)
Suicide Crisis Helpline: 0508 828 865 (0508 TAUTOKO) (available 24/7)
Youthline: 0800 376 633
Kidsline: 0800 543 754 (available 24/7)
Whatsup: 0800 942 8787 (1pm to 11pm)
Depression helpline: 0800 111 757 (available 24/7)
If it is an emergency and you feel like you or someone else is at risk, call 111.