To control the problem of bloat in ruminants, ___________ is added to the feed.

Bloat in ruminants is a condition that can occur when these animals consume large amounts of fermentable feed, especially lush pasture high in soluble carbohydrates. It results from an accumulation of gas in the rumen that cannot be expelled, leading to distension and potentially fatal consequences. To mitigate this condition, poloxaline is incorporated into the feed.

Poloxaline is a surfactant that helps reduce the surface tension of the foam produced in the rumen, enabling the trapped gas to escape more easily. By improving gas release, poloxaline effectively helps alleviate the symptoms of bloat. Its mode of action aids in the stabilization of the foam, making it a valuable preventive additive in managing bloat in ruminants.

Other options, while related to animal health or nutrition, do not directly address the prevention or control of bloat. Probiotics, minerals, and vitamins contribute to overall gut health, nutrition, and immune function, but they do not have the specific mechanism needed to tackle the foaming and gas retention issues that lead to bloat. Thus, poloxaline stands out as the targeted solution in this context.