Pigs and poultry are the fastest growing livestock industries globally. They are the most important species in the Pacific Island countries (PICs), providing animal protein security and rural income. Pigs and poultry are monogastric animals that often compete with humans over already scarce feed ingredients such as cereal grains and oilseed cakes. High feed cost is a major constraint to efficient species production on a commercial scale in PICs due to the unavailability of traditional ingredients in the region. Available alternative or non-traditional ingredients are bulky, highly variable in nutrient content and may contain several antinutritional factors (ANFs) that limit their efficient use in pig and poultry diets. With appropriate processing and correct feed formulation, these ingredients could be included in diets to maintain productivity and reduce costs on smallholder pig and poultry farms. This guide will equip livestock extension staff and farmers with knowledge to maximize the utilization of low-cost ingredients for efficient pig and poultry production in the region. There is, however, an additional need for face-to-face trainings on feed processing and diet formulation in the region.