Is raising pigs with bean sprouts good or bad for fattening pigs?

Adding 1/4 bean sprouts to the feed to feed pigs, if it is used to fattening pigs, will it have an effect on fattening? Do you feed pigs with bean sprouts? -- I also want to know how much urea is added to the bean sprouts during the growth of bean sprouts. Do bean sprouts still need to be produced with urea? This is the first time I've heard of it, but I just see that bean sprouts are bleached with bleach when they are for sale.