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Terminology of Animal Nutrition
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Comparative composition of plant and animal cells and tissues
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Digestive enzymes

  • Most enzymes are initially secreted in the form of inactive precursors, which are activated after secretion into the trace.
  1. Carbohydrases: Hydrolyze the glycosidic linkage between sugar units. Eg: Malise on maltose, Sucrase on sucrose, Lactase on lactose and trehalase on trehalose respectively.

Enzymes

Sources

Substrate

α-amylase

Saliva

Starch, glucose, dextrin

Sucrase

Small intestine

Sucrose

Maltase

Small intestine

Maltose

Lactase

Small intestine

Lactose

Trehalase

Small intestine

Trehalose

Oligo-1,6 glycosidase

Small intestine

Dextrins

 

  1. Proteolytic enzymes: Concerned with hydrolysis of the peptide linkage.

Enzyme

Source

Substrate

Pepsin

Gastric mucosa

Protein and peptides

Renin

Gastric mucosa ( young calves)

Protein and peptides

Trypsin

pancreas

Protein and peptides

Chymotrypsin

pancreas

Protein and peptides

Carboxypeptidase

pancreas

Certain peptides

Elastages

pancreas

Elastin and other protein

Amino peptidase

Small intestine

Certain peptides

Dipeptidase

Small intestine

Dipeptides

 

  1. Lipolytic enzymes : Break down fats into fatty acids and glycerol.

Enzymes

Sources

Substrate

Gastric lipase

Gastric mucosa

Fats and other organic esters

Pancreatic lipase

Pancreas

Fats and other organic esters