Rumen acidosis is an example of which forestomach disorder type?

• A. Abnormal contents
• B. Abnormal motor function
• C. Infectious disease
• D. Nutritional deficiency

Answer: (A)

Rumen acidosis is best classified as an abnormal contents disorder because the primary issue is the chemical and microbial composition of the rumen contents after consuming a large amount of rapidly fermentable carbohydrates. The sudden influx of starch shifts rumen fermentation toward lactic acid–producing bacteria, lowering the rumen pH and creating an abnormal fermentation milieu. It isn’t mainly a motor problem (that would be abnormal ruminal motility), nor an infectious disease, nor a nutritional deficiency (which would involve lack of nutrients rather than excessive, overly fermentable content). The key idea is that the problem originates in the contents and their fermentation in the rumen.