Well-fancied duo Stamina and Rockabill are race-day withdrawals from this afternoon's Group 3 Spring Stakes at Newcastle.

Peter Moody's Stamina exhibited a cough this morning and has been scratched on vet's advice. No explanation has yet been given as to why Gai Waterhouse's Rockabill has been pulled out.

Stablemate Equator is now $4.60 with Waterhouse chasing back-to-back wins in the race following Proisir's success 12 months ago.

Savvy Nature is second pick at $5.50.