Bovine Pregnancy Toxemia Study Guide

Overview and Clinical Importance

Pregnancy toxemia (also known as ketosis of pregnancy or fat cow syndrome) is a metabolic disease occurring in late gestation cattle, characterized by inadequate glucose homeostasis leading to negative energy balance, ketosis, and hepatic lipidosis. This condition is more common in beef cattle than dairy cattle due to differences in dietary management and timing of late gestation coinciding with poor feed availability.

The disease develops when maternal glucose production cannot meet the energy demands of the rapidly growing fetus, particularly during the last 2 months of gestation. Pregnancy toxemia carries a guarded to grave prognosis, especially in recumbent animals, making early recognition and prevention essential for NAVLE success.

Etiology and Pathophysiology

Underlying Mechanism

The pathophysiology of bovine pregnancy toxemia centers on disruption of maternal glucose homeostasis during a period of maximum fetal energy demand. The gravid uterus and fetoplacental unit are major consumers of maternal glucose, with glucose accounting for approximately 50-60% of fetal-placental energy substrates and amino acids providing an additional 30-40%.