Soybean meal is the most commonly used protein source in swine diets in the United States. In addition to conventional soybeans, researchers have bred varieties of soybeans to meet various nutritional needs of pigs. For example, soybeans low in oligosaccharides have been developed for feeding to weanling pigs, who cannot digest the oligosaccharides in conventional soybeans and may suffer reduced performance and even illness as a result. High protein soybean varieties have also been developed.