Glyn Schofield has been fined $1000 for an altercation with fellow jockey James McDonald after the Randwick Guineas.

Schofield rode Purple Sector who copped a hefty bump mid-race and eventually trailed the field by more than 30 lengths.

After the race, Schofield fronted McDonald, who rode Aramayo, in the jockeys' room.

"I asked James what he thought he was doing," Schofield told stewards. "I was agitated. I was a bit hot under the collar.

"I did get in his face, I gave him a shove. I was carrying my saddle and skull cap."

But as it turned out, Schofield shoved the wrong person and it was in fact Josh Parr on third-placed Nakeeta Jane who caused the interference.

Parr was subsequently suspended and will be out from Wednesday but back in time to ride Nakeeta Jane in the Group One Vinery Stud Stakes on March 30.