What enzyme acts on fats in the feed, converting them to fatty acids and glycerol?

The enzyme that acts on fats in the feed, converting them into fatty acids and glycerol, is indeed lipase. Lipase is a digestive enzyme specifically responsible for breaking down lipids (fats) in the diet. It catalyzes the hydrolysis of triglycerides, which are the main components of dietary fats and oils, into free fatty acids and glycerol, which can then be absorbed by the body.

In the digestive system, lipase is secreted by the pancreas and works in conjunction with bile, which helps emulsify fats to increase the surface area available for lipase to act on. This enzymatic action is crucial for proper fat digestion and absorption, which provides the body with essential fatty acids and serves as a significant energy source.

The other enzymes listed—amylase, protease, and cellulase—are specialized for different types of macromolecules. Amylase breaks down carbohydrates into sugars, protease digests proteins into amino acids, and cellulase helps in breaking down cellulose, a complex carbohydrate found in plant cell walls. Therefore, each of these enzymes has its distinct role in digestion, while lipase is specifically tailored for fat metabolism.