To render incapable of reproducing sexually
If you are not a professional breeder and/or you do not wish to deliver and care for a litter of kittens, spay and neuter your cats.
spay female rabbits, the client demand was not there.
Secondly, even if vets had been technically able to safely spay female rabbits, the client demand was not there.
Many of them also spay or neuter the pets, so that when you adopt, you have one less chore to worry about.
I'm really surprised that the Humane Society did not spay your cat.