Recent scientific advancements in pig breeding and genetics have introduced various methods to modify or control pig sexual development, primarily for animal welfare and industrial efficiency. Development of "Testicle-Free" Pigs

A significant development in animal welfare is the creation of genetically modified pigs that .

Beyond commercial farming, genetically modified pigs are increasingly used as "models" for human health:

: Traditionally, male piglets are castrated shortly after birth to prevent "boar taint," an unpleasant smell and taste in the meat that develops as boars reach puberty.