Start Date: Aug 03, 2010
End Date: Aug 02, 2015
The impact of dietary ingredients on nutrient utilization in the pig and subsequent nutrient excretion and emission of gasses into the environment will be assessed through altering the source and level of dietary protein and carbohydrate. The protein level will be adjusted relative to the level of soybean meal and amino acid supplementation utilized in diet formulation, while the protein source factor will be accomplished by replacing soybean meal with either canola meal, corn gluten meal, or poultry meal. The source and level of complex carbohydrate will be accomplished by utilizing barley, beet pulp, distillers dried grains with solubles, soybean hulls, and wheat bran as a partial replacement of soybean meal. Nutrient retention, excretion, and gas emissions will be accomplished using animal metabolism trials and the employment of a manure storage system currently in place at the lab. Microbial ecology of the large intestine (via fresh feces) and manure, as affected by the source and level of protein and carbohydrate, will be assessed by classical and molecular methods currently employed at the Unit, using the same pigs and diets as described above. The impact of dietary regimens on nutrient metabolism and immune function will be accomplished by utilizing similarly formulated diets as above, but on a separate group of pigs, with assessment of systemic and intestinal immune system function using techniques currently being utilized within the Unit. Lastly, reduction of Salmonella colonization of the swine gastrointestinal tract for subsequent reduction of shedding into the environment will be accomplished by administration of a chemical compound to disrupt pathogen sensing, vaccination using an attenuated S. Typhimurium strain, and manipulation of crude protein levels in the diet (as described above).