This analysis assesses the life cycle greenhouse gas (GHG) emissions of swine and poultry production using new diets. The updates in the diet formulations and their impacts on the feed conversion rate and live body weight, together with updates of key ingredients and manure management modeling in the GREET model, have led to some changes in the life cycle GHG emissions of the new swine and poultry diets, as well as the swine and poultry production. Variation in the emissions across diets is observed, highlighting the importance of considering GHG emissions when formulating new diets for swine and poultry production.

This study addresses the greenhouse gas (GHG) emissions of swine and poultry production using new diets, using the latest version of Argonne's Greenhouse gases, Regulated Emissions, and Energy use in Technologies (GREET) model. This study adopts an established life cycle analysis (LCA) methodology to holistically quantify the GHG emissions of new diets and the resulting live weight animal production, considering the feed conversion rates of the new diets and the net GHG effects of animal manure management. The results of the study show that different diets vary in the life cycle GHG emissions due to variation in the diet formulation that varies in the content of soybean meal and other ingredients for the diets, the resulting feed conversion rates, as well as the manure management impacts. The results highlight opportunities to reduce GHG emissions via formulating new diets with varied levels of soybean meal and other ingredients for swine and poultry production in the United States.