The typical owner of a mixed-breed house cat usually has no desire to breed his pet, and a wise owner will have the cat spayed or neutered. It may surprise such owners that there is a whole branch of veterinary science devoted to reproduction—specifically, devoted to getting animals to mate and produce new litters.
Breeding is serious business to the obvious people: breeders, who can’t sell their purebred cats if the toms and females aren’t mating properly. So, just as human infertility clinics do a thriving business, veterinarians involved in animal reproduction manage to stay busy.