Neutering or Castration (Orchidectomy)
If you intend to have your male cat neutered, congratulations. You are not part of the problem of over-population - of mostly forgotten or unwanted cats left out near busy streets, catching diseases, producing more ill-fated kittens. People often get very excited with their new kittens and after the novelty wears off, they leave them out to fend for themselves - a sad fact. Another good reason to have your male cat castrated, is that if he is not, he could become very aggressive (for an indoor cat).
Neutering involves the veterinarian surgically removing the testicles, the male sex organs. Part of the spermatic cord and both testicles are removed, then a tiny incision is made in the base of the scrotal sac. After tying and cutting the spermatic cord, with its blood vessels, the testicles are removed. In most cases, stitches are not required. Eventually the scrotal sacs recede.
Cats should get "fixed" before they mature sexually. Before 6 months is the desirable age for the operation. However, a cat of any age can be castrated safely. Following the operation, the hormone levels drop off gradually over a period of six weeks. These hormonal changes affect his behaviour which is evident after approximately one month - he calms down, becomes more affectionate, docile, and usually wants to have human companionship more often.