Cow Pancreas: Function, Anatomy, and Digestive Role

Anatomy

• Location: Dorsal to stomach, within the duodenal loop.
• Structure: Diffuse, lobulated; no distinct head/body/tail like humans.
• Ducts: Multiple pancreatic ducts empty into duodenum (major & accessory).

Exocrine Pancreas (Digestive)

• Acinar cells secrete enzyme-rich juice (10–20 L/day in lactating cow).
• Key enzymes:
  • Amylase → starch → maltose/glucose
  • Lipase (with colipase) → triglycerides → fatty acids + monoglycerides
  • Proteases (trypsinogen, chymotrypsinogen) → activated in duodenum → peptides/amino acids
  • Nucleases, phosphatases
• Bicarbonate-rich secretion neutralizes acidic chyme.

Endocrine Pancreas (Islets of Langerhans)

• β-cells: Insulin → ↓ blood glucose (glucose uptake, lipogenesis, protein synthesis).
• α-cells: Glucagon → ↑ blood glucose (glycogenolysis, gluconeogenesis).
• δ-cells: Somatostatin → inhibits insulin/glucagon.
• PP-cells: Pancreatic polypeptide → regulates exocrine secretion, gastric emptying.

Physiological Integration

Ruminant digestion: Microbial fermentation in rumen → VFAs absorbed → hepatic gluconeogenesis → insulin/glucagon regulate glucose homeostasis. Pancreatic enzymes act on post-ruminal digesta in small intestine.