Influence of body lesion severity on oxidative status and gut microbiota of weaned pigs

•Body lesions during weaning can affect pigs’ health.•High lesion score in the first-week postweaning can alter oxidative status and gut microbiota.•These alterations can affect immune response up to 7 weeks postweaning.•Social stress due to body lesion disrupts homeostasis and affects gut microbiota.•Strategies to reduce lesions should be implemented to avoid antibiotic use.