Bacterial synthesis supplements nutrient levels in the diet. Less efficient digestion results in complex nutritional requirements for monogastrics. Ten essential amino acids plus three semi-essential amino acids. An Analogy for nutrient functions. Carbohydrate and fat constitute the gasoline or fuel that provides energy.
Vitamins furnish additional lubrication and grease to allow efficient functioning.
Water provides all the interlinking support systems like electrical, cooling, braking, exhaust, etc. All physical and chemical processes used to break down the feed and make it ready for absorption. Elements of the digestive process. Particle size reduction increases the surface area of feedstuffs. Enzymes are organic catalysts.