Bovine Lactic Acidosis Study Guide

Overview and Clinical Importance

Ruminal lactic acidosis (also called grain overload, carbohydrate engorgement, or rumen overload) is one of the most economically significant digestive disorders in cattle production. It results from the ingestion of excessive amounts of rapidly fermentable carbohydrates by animals not adapted to such diets, leading to profound disturbances in rumen microflora, systemic acid-base balance, and multiple organ function.

The condition exists on a continuum from subacute ruminal acidosis (SARA) to acute ruminal acidosis (ARA), with severity depending on the quantity of grain consumed relative to the animal's adaptation status. Understanding this disease is essential for the NAVLE as it represents a high-yield topic involving pathophysiology, diagnosis, treatment, and prevention.

Etiology and Risk Factors

The primary cause of ruminal acidosis is the ingestion of highly fermentable carbohydrates (grains such as wheat, barley, and corn) by animals not adapted to such diets. The key point is that ruminants must be gradually adapted over 2-3 weeks to high-grain diets; otherwise, acidosis commonly occurs.