The overarching goal of this proposal was to increase the usage of soybean meal and soyhulls in pig nutrition. The first part of this study explored the effects of including high levels of soybean meal (SBM) in grow-finish pig diets. Soybean meal is a common protein and energy source in swine nutrition, with its inclusion often dictated by the cost relationship between SBM and synthetic amino acids such as lysine and methionine. Anticipated increases in domestic SBM production could lower its price, potentially encouraging higher-than-usual SBM levels in pig diets. However, the impact of over-formulating SBM on pig health and performance is not well understood. The research tested increasing SBM levels across four diet phases in grow-finisher pigs, with inclusion rates ranging from 15% to 75%, depending on the phase. All diets were corn-SBM based, iso-caloric, and met or exceeded amino acid requirements. Results showed that feeding SBM beyond amino acid requirements improved energy efficiency and reduced carcass backfat, without compromising growth performance or health after pigs adapted to high SBM diets in Phase 1. However, overfeeding SBM led to increased nitrogen excretion, which may require closer attention to barn ventilation and manure application management. Overall, the findings from this deliverable suggest high SBM inclusion rates above amino acid requirements can be used without adverse effects on grow-finisher pig performance or health. In the second part of the study, soybean hulls were evaluated in pig diets. Soybean hulls, a source of dietary fiber, can be included in grow-finish pig diets to reduce overall feed costs. However, dietary fiber is known to reduce nutrient digestibility, feed efficiency, and carcass yield. These negative effects may be mitigated by removing high-fiber diets before marketing. In this study, two experiments were conducted: experiment 1 involved four diets containing 0%, 7.5%, 15%, or 22.5% soybean hulls, while experiment 2 tested the effects of feeding pigs either a 0% or 22.5% soybean hull diet continuously or switching from 22.5% to a 0% fiber diet 13 or 27 days before marketing. These experiments aimed to assess the impact of soybean hulls on growth performance, nutrient digestibility, and carcass composition. Results indicate that while dietary fiber negatively impacts feed efficiency and carcass composition up to 22.5% inclusion, the performance of a carcass yield can moderately recover if high-fiber diets are withdrawn at least 13 days before marketing. In addition, compared to the NRC (2012), we estimated the digestible energy and metabolizable energy value of the soybean hull ingredient to be higher