Fig 2. Microbial diversity in cloacal swabs of layer chickens fed for 23 weeks on control (C) and 1%, 2% or 4% w/w biochar (BC) amended diets (Trial 1).

a) Phylum abundance of Proteobacteria and Verrucomucrobia and b) Genus abundance of known pathogenic Gallibacteruim, Campylobacter and the beneficial Akkermansia.