Cattle, pigs, horses, goats, and sheep are castrated, almost always without anesthetic. This is done to diminish animal’s inclination for sexual behavior, usually in regards to aggressive actions toward humans, other animals, and property. It is also done as a means of boosting an animal’s weight gain and growth, as well as stopping an animal from becoming sexually mature, which renders their meat undesirable because of taste and odor produced by pheromones.
Pain medications are generally not administered during the genital castration process. This is usually because administering anesthetic not as efficient. If the animals are to be slaughtered before sexual maturity, castration is not viewed as necessary, though often it is still done to reduce the likelihood of aggression between animals in cramped quarters.