I agree 4.5 months is too young. My granddad waited until they were 11 - 12 months unless they got too onery, then they were gelded a little sooner.
This link might help. Horse Gelding the Male Horse and Aftercare by Cherry Hill
It's well worth reading the entire article but it says in part:
| When to geld is largely a management decision. Often, facilities require that young horses of both sexes be housed together, so gelding at about 12 months has become popular in order to avoid accidental breeding at puberty (18 to 24 months). It is best to assess each individual though, to determine the optimum gelding time. Some weanlings become preoccupied with nearby mares and may go through or over fences to get near them. In other cases, a long yearling may only quietly watch the mares. Others may develop an obsession with their penises and may devise various means of masturbation or self-mutilation. Other early gelding candidates include those that show premature signs of excess bulk such as a thick, cresty neck. Such individuals might best be gelded at eight months or earlier while others remain very supple and moderate in musculature well into their two-year-old year. |