Soy hulls are the co-product of milling soy meal, they have long been regarded internationally as an excellent source of fibre for horses because of there superior digestibility.
This superior digestibility is why Soy Hulls are also included in the 'Super Fibre' family of Fibres; alongside, Beet Pulp and Linseed Flake.
People sometimes confuse the nutrient profile of Soy Hulls with Soyabean Meal and think they have a similar nutrient content. However, Soyabean Meal is a highly concentrated quality protein meal used as an ingredient in many muscle & conditioning concentrates.