This study examined how feeding sows a supplement called Euglena gracilis (an algae-derived prebiotic) affected the gut bacteria of both the sows and their piglets. Piglets born to supplemented sows weighed more at weaning and had fewer cases of diarrhea during the nursing period. The supplement changed the types of bacteria in both the sows’ and piglets’ guts in beneficial ways, promoting healthier and more stable gut communities that supported better growth and digestive health.