Additionally, despite some male cat owners' fears that neutering tom cats is the unkindest snip of all, we would stress that neutering both male and female cats is essential for controlling the cat population. Cats Protection has long been an advocate of the neutering of all cats and kittens not required for breeding as part of their commitment to raising standards of feline care. A female cat can start to reproduce from six months old, having up to three litters a year, with up to five or six kittens per litter.
Male cats are fertile from six months, and can impregnate up to thirty-two female cats a year.
Neutering makes sense for many reasons. A neutered cat makes a better family pet. It is not as territorial, is less aggressive, more affectionate and less likely to wander. Neutering can also quite literally save a cat's life. Cats that fight are more at risk of contracting either of these diseases.