If you have more than one rabbit it is best, to prevent lots of unwanted young, to have them neutered. A lot of research has been carried out recently on the subject of neutering pet rabbits.
Entire male rabbits, that is males which have not been neutered or castrated, can be very aggressive and mark their territory if kept together. Unneutered males and females kept together may also fight, and females kept together will not necessarily get on. If you are not going to breed with your rabbit it is best to have it neutered.
Male rabbits (bucks) can be castrated from around 3 to 4 months of age. This is the age at which the male rabbit can actually start to be able to breed. The testicles normally descend at this time making the castration operation possible.
Female rabbits (does) can be neutered (spayed) at 5 to 6 months of age. This is the age at which the doe can come into season, is sexually mature, and can start to breed. The spaying operation involves the removal of the ovaries and the womb. Research shows that a high percentage (up to 80%) of unspayed females can develop womb cancer (ovarian or uterine). The risk of this happening is obviously reduced if your rabbit is spayed.
Once the instinct to breed has been removed by neutering you will find that your rabbit is calmer and less prone to being aggressive and destructive.