colthood

noun

1. (uncountable)The state of being a colt; the youth of a (male) horse.

   “Their ruddy faces and somewhat cumbrous forms belong to the animal period of life that links together boyhood, colthood and calfhood.”

   “She had a vague notion that all horses nowadays were trained from their colthood to buck--whatever that was.”

   “In the old days of his colthood, a barelegged boy used to come into the pasture and jump on his bare back.”