Generally, geldings are much easier than stallions to handle, particularly around mares. Unless the plan is to breed from a proven stallion with a good performance record, it is best to consider castration. There are enough unwanted horses already and having a colt can result in surprise foals surplus to requirements.
Equine castration, or gelding, is one of the most frequent routine operations any equine vet performs. It is usually straightforward, although a recent review from Liverpool vet school
