Gut metagenomics of finishing pig fed with an olive mill wastewater polyphenol extract supplementation.

Pig microbiota influences overall animal health and diet is a possible strategy to target gut microbial composition and improve animal growth, including environmental and economic advantages. Dietary polyphenols may improve gut health because of their antimicrobial and antioxidant properties, although their utilization in dietary formulation for monogastrics is still emerging. The present study investigated the effects of two dosages of polyphenols from an olive mill wastewater (OMWW) extract in pigs diet on the morphology and microbiota composition (16S rRNA sequencing of variable region V3-V4) of jejunum and ileum. One hundred thirty-five female Landrace x Duroc finishing pigs were randomly allocated into three groups fed with: control diet (C); C diet supplemented with 74 ppm of OMWW polyphenols (P-LOW); C diet with 225 ppm of OMWW polyphenols (P-HIGH). The experiment lasted 85 days and 45 animals per group were sampled.