Gullet Size. The angle of the points, the shape of the panels, and the width of the gullet plate work together to create a specific gullet size, and that size in turn determines how the saddle sits on the horse.
Carbohydrates and proteins dissolve in water, which allows digestive enzymes to go to work on them, but fat does not. Your liver produces a substance called bile, which is secreted into the small intestine. This breaks up fat in a process called emulsification, which effectively make the fats water-soluble. Digestive enzymes in the small intestine can then break them down.
What does hydrogenation do to fat? Hydrogenation adds hydrogens to unsaturated fats to reduce the number of double bonds and make fats more saturated and resistant to oxidation. Hydrogenation can increase a product's shelf life and add a desirable texture.