[h=1]Neutering[/h]From Wikipedia, the free encyclopedia Jump to: navigation, search Romanino, Scene of a cat castration, 1531â€“32, Castello del Buonconsiglio, Trento Neutering, from the Latin neuter (of neither sex[SUP][/SUP]), is the removal of an animal's reproductive organ, either all of it or a considerably large part. The term is often used in reference to males whereas spaying is often reserved for females. Colloquially, both terms are often referred to as fixing.[SUP][/SUP] While technically called castration for males, in male horses, the process is referred to as gelding. Neutering is the most common sterilizing method[SUP][disambiguation needed][/SUP] in animals. In the United States, most humane societies, animal shelters and rescue groups urge pet owners to have their pets spayed or neutered to prevent the births of unwanted litters, contributing to the overpopulation of unwanted animals in the rescue system.