ELANCO Advanced Animal Science Practice Exam

Which diet type tends to favor acetate production in the rumen?

Starch-rich diet Forage-rich diet High-protein diet Low-fiber diet

Correct Answer:

Forage-rich diet

Explanation:

In the rumen, the type of substrate determines which volatile fatty acids (VFAs) the microbes mainly produce. Forage is rich in structural carbohydrates (fiber) that require fibrolytic bacteria to break down. These microbes predominantly generate acetate as their main end product. So, a forage-rich diet shifts fermentation toward acetate. In contrast, starch-rich diets feed amylolytic bacteria that ferments more quickly and tends to produce more propionate (and sometimes lactate) and lower rumen pH, which shifts the VFA mix away from acetate. High-protein or low-fiber diets can alter nitrogen balance and overall fermentation, but they don’t favor acetate production as strongly as fiber does. Thus, forage-rich diets tend to favor acetate production in the rumen.

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