Proteins often are associated with increasing manure odor intensity, so using amino acids to offset some dietary protein may help. Another strategy is balancing dietary carbohydrate with protein. Group animals according to nutrient requirements . This reduces the gap between different nutrient requirements and allows producers to formulate diets to more closely meet requirements. Use of specific feed ingredients .
Studies are underway to determine the effect of various feed additives on manure odors.
Some work showed less malodor when peppermint oil was added to the diet. An ISU study considered the effect of adding bloodmeal to a nursery pig diet, and observed a trend of increasing odor intensity with increasing level of bloodmeal. Consider mineral and water sources . Producers must consider mineral inputs and their impact on total dietary sulfur, which itself is odorous. Depending on the geographical location and source, water supplies might also contain a fair amount of sulfur, and producers should consider this. 5.