Which preposition to use with geld

in Occurrences 2%

Old man Bobo had a bay gelding in training for the half-mile race, Comet, out of Shooting Star, by Meteor.

with Occurrences 1%

It was done, and a lantern-jawed cowpuncher brought out a piebald gelding with long ears and sleepy eyes.

Which preposition to use with  geld