Which measure is most directly aimed at preventing frothy feedlot bloat?

• A. Add roughage to the ration
• B. Avoid fine grinding
• C. Add antifoaming agents
• D. Ionophores

Answer: (C)

Frothy bloat happens when gas in the rumen becomes trapped in a stable foam, so eructation can’t occur and the animal distends and becomes distressed. The measure that directly targets this problem is using antifoaming agents, such as poloxalene, which reduce foam stability and surface tension in the rumen. By breaking the foam, gas can escape and the bloat risk is reduced. Other strategies—adding roughage, avoiding fine grinding, or using ionophores—can help reduce bloat risk indirectly by influencing chewing, saliva production, particle size, or fermentation, but they do not act on the foam itself as directly as antifoaming agents do.