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Pellet binders are used primarily for their ability to improve pellet quality but they often contribute nutrients as well. For example, lignin sulfonate may contain metabolizable carbohydrate (AAFCO, Morrison) and ureaformaldehyde may be a source of slow-release nitrogen for ruminants (Gribbins). In contrast, wheat and whey are used primarily for their nutrient value but are also known to have a positive binding effect. The nutrient contribution of a binder should be recognised and included in the formulation, but the real reason for using these ingredients is because of the impact physical form of the pellet has on animal performance.