Coproducts from the food and agricultural industries have the potential to partly substitute grain in diets for empty nonlactating sows. Many coproducts are high in fiber and with diverse fiber composition. Some being easily fermented, while others are more resistant to fermentation giving rise to a large variation in the total tract digestibility and utilization of nutrients and energy. How well fiber-rich coproducts are digested and utilized is poorly understood in sows, but it is important to ensure an optimal energy and protein composition of the feed depending on the physiological stage of the sow. This study aimed to increase knowledge on the digestibility and utilization of six fiber-rich coproducts potentially to be included in the sow’s feed. We found pea hulls and sugar beet pulp suitable as grain replacers due to their high total tract digestibility and no negative effects on energy and protein utilization. Potato pulp and brewers spent grain were also well suited. However, caution should be taken in balancing diets because of increased fecal and urine nitrogen output, which will increase environmental impact. Seed and pectin residues primarily serve as gut fill.

Read the full article in the Journal of Animal Science.