Shock from a horse breeder after Starship Children's Hospital's rejected a donation of more than half a million dollars.

After a high-profile race win, Mark Chittick attempted to donate $570,000 dollars to the hospital.

The Starship Foundation says while Starship is grateful for contributions, it's unable to accept all donations due to existing partnership obligations.

But Mark Chittick told Mike Hosking the donation could've made a huge difference.

He'd have thought the children's hospital would've been a worthy recipient, as it would've helped children and families in compromised positions.

The Starship Foundation's calling for urgent donations, with an ambitious target to reach $20 million dollars donated every year by 2023.

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