Best age for castration

10.10.1 Best age for castration Bulls can be castrated as young as 2-3 months of age. Goats and sheep can be castrated as young as 2-3 weeks of age. The advantage of castrating young animals is that it is least traumatic for the animal, easiest, and safest. The disadvantage is a greater likelihood of developing stones that block the urethra and prevent the animal from urinating. Horses and mules are usually castrated at 2-3 years of age. Although mules are sterile and cannot reproduce, they can still mate because the testicles produce testosterone. Uncastrated mules can be difficult to handle. Pigs are best castrated around two weeks of age.