Controlling hog manure odor through swine diets is among the hottest industry research topics today. Researchers at Purdue University may have found a way to reduce odor by feeding hogs soybean hulls.

Brian Richert and Allan Sutton reduced the amount of soy protein in diets, then added synthetic limiting amino acids and 10 percent soybean hulls. This reduced the amount of dietary crude protein by 2.7 percent.

The diet cost no more than traditional diets, yet it reduced odor in the hog barn and nutrient loading in the manure. Aerial ammonia concentrations, as well as total nitrogen and ammonia in the pit and pH levels in the pit were all lower with the new diet. Aerial hydrogen sulfide levels also appeared to be lower, according to the research.

For more information contact Sutton at (765) 494-8012 or e-mail