NAVLE Musculoskeletal

Bovine Umbilical Hernia Study Guide

Umbilical hernia is the most common congenital defect encountered in bovine calves, occurring when abdominal contents protrude through a defect in the body wall at the umbilicus.

Overview and Clinical Importance

Umbilical hernia is the most common congenital defect encountered in bovine calves, occurring when abdominal contents protrude through a defect in the body wall at the umbilicus. This condition represents a significant area of clinical importance on the NAVLE due to its prevalence (estimated 4-15% in calves), hereditary implications, and the need for proper surgical management.

Understanding umbilical hernias requires knowledge of normal umbilical anatomy, embryologic development, risk factors for hernia formation, diagnostic approaches, and both conservative and surgical treatment options. Holstein-Friesian calves are particularly predisposed, and female calves are more commonly affected than males.

Structure Function Postnatal Fate
Umbilical Vein (1) Carries oxygenated blood and nutrients from placenta to fetal liver via ductus venosus Becomes round ligament of liver (falciform ligament)
Umbilical Arteries (2) Carry deoxygenated blood from fetus to placenta; arise from internal iliac arteries Become lateral ligaments of bladder (round ligaments)
Urachus (1) Connects fetal bladder to allantoic sac for waste elimination Should atrophy and disappear; becomes median ligament of bladder

Umbilical Anatomy and Embryology

Normal Umbilical Structures

The umbilicus in newborn calves consists of four essential structures that connect the fetus to the dam during gestation:

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