Wiktionary
colthood
n. The state of being a colt; the youth of a (male) horse.
Usage examples of "colthood".
This being winter in forest country, each warrior had brought only two remounts, but those were of the finest: hand-reared from colthood, drilled to respond to voice, knees, balance as well as reins.
Even now, when the top of the hill was gained, and he knew that he was within a mile of the stable which had been his home since colthood, he showed no undue haste or impatience, but waited quietly, until Friend Mitchenor, by a well-known jerk of the lines, gave him the signal to go on.
The mares had been schooled from colthood to face and o'erleap walls of flame.