Maternal supplementation with a synbiotic has distinct outcomes on offspring gut microbiota formation in A/J and C57BL/6 mice, differentially affecting airway inflammatory cell infiltration and mucus production

•Maternal synbiotics modulate gut microbiota depending on host genetics.•Maternal synbiotics affect allergic outcomes in A/J and B6 offspring differently.•Microbiota diversity was not enough to regulate airway eosinophilia in allergic A/J mice.