Intravaginal injection of Lactobacillus johnsonii may modulates oviductal microbiota and mucosal barrier function of laying hens

The avian oviduct is connecting to gastro-intestinal tract through cloaca, and there is exposing against pathogenic bacteria from intestinal contents. Therefore, the improvement of the mucosal barrier function in the oviduct is important for safe poultry production. Lactic acid bacteria are known to contribute to strengthening the mucosal barrier function in the intestinal tract, and a similar effect is expected for the oviduct mucosa of chickens. The purpose of this study was to clarify the effects of vaginal administration of lactic acid bacteria on the mucosal barrier function of the oviduct.