What is the function of tonifying health in the application of feed?

What role does excellent complement have in the application of feed??? Please advise experts, a lot of support oh-------------------------------------- Please introduce-------------------------------------- Protein seems to be about 50%, yellow, granular. I don't know anything else. -------------------------------------- We have used it in piglet feed, reducing the amount of soybean meal, available 5~8%, the effect is good, but the price is a little high-------------------------------------- Ubujian is fermented soybean meal. It's better than soybean meal!-------------------------------------- Said fermented soybean meal contains a part of small peptides, which is better for animals.