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Nitrogen Excretion and Ammonia Emissions from Pigs Fed Modified Diets

^a Department of Animal Science
^b Department of Agricultural and Biosystems Engineering, Iowa State University, Ames, IA 50011
^c USDA-ARS Swine Odor and Manure Management Research Unit, Ames, IA 50011

View larger version (21K): [in a new window]   Fig. 1. Least squares means of ammonia emission rates from growing-finishing pigs. In Trial 1 (n = 683, SEM = 0.43 mg min–1; P = 0.098), pigs were fed a control corn and soybean meal diet (C), a reduced crude protein diet containing Lys (L), and a further reduced crude protein diet containing Lys, Met, Thr, and Trp (LMTT). In Trial 2 (n = 600, SEM = 0.27 mg min–1; diet P = 0.885), pigs were fed a diet containing Lys and no yucca (L + 0), a diet with Lys and 62.5 mg kg–1 of a yucca product (L + 62.5), and a diet with Lys and 125 mg kg–1 of a yucca product (L + 125). Means without a common superscript letter differ (P < 0.05).

View larger version (28K): [in a new window]   Fig. 2. Ammonia emission rates as time after chambers were cleaned out progressed within each week. Three growing-finishing pigs in each chamber were fed a control corn and soybean meal diet (C), a reduced crude protein diet containing Lys (L), and a further reduced crude protein diet containing Lys, Met, Thr, and Trp (LMTT). Diet effect (P = 0.098); time since cleaning within week linear covariate effect (P < 0.001).

View larger version (33K): [in a new window]   Fig. 3. Ammonia emission rates as time after chambers were cleaned out progressed within each week. Three growing-finishing pigs in each chamber were fed a control corn and soybean meal diet with Lys and no yucca (L + 0), a diet with 62.5 mg kg–1 yucca product (L + 62.5), and a diet with 125 mg kg–1 yucca product (L + 125). Diet effect (P = 0.885); time since cleaning within week linear covariate effect (P < 0.001).