Two feeding studies were conducted to examine the impact of dietary inclusion of specific feed ingredients on manure characteristics and manure odor. In one study, 72 finishing pigs were used to evaluate the effect fo distillers dried grains with soluables on pig performance, manure characteristics and odorous emissions. TjheeThree diets containing 0, 5, and 10% DDGS were fed during four, 6-week periods. Week 1 served as a dietary adjustment period. Animals wre housed in two feeding rooms with one treatment per room. A new group of animals was used nfor each feeding period. Diets were replicated four times. Rooms were equipped with four individual shallow manure storage pits that were cleaned once weekly. On day 4 and 7 of each week, manure pit samples, for chemical nalysis, and air samples for olfactometry analysis, were collected from each room. Odor dilution threshold was greater on day7 than day 4 of manure storage across all treatments. No treatment differences in manure compostion were noted. In the second study, weaned pigs were fed isonnitrogenous diets containing 0, 1.5 or 3% bloodmeal. Pigs were housed by diet in one or four individual feeding rooms. A new group of pigs was used for each of the two, 4-week feeding periods. During period 1, the 3% bloodmeal diet was fed in two of the four rooms; the 0% bloodmeal diet was fed in two rooms during period 2. Manure samples, for chemical analysis, and air samples for olfactometry analysis were collected 2 days per week during week 2 through 4. No significant treatment differences were observed for odor dillution threshold. Longer manure storage time, 6 days versus 4 days, resulted in largeer odor dilution ratio. Manure composition was unaltered by storage time. Results suggest that odor intensifies during storage.