Overview of experimental design (a), experimental setup (b), and microbiota transfer efficacy (c). Germ-free mice were gavaged with either a donor pool FMT from wild (indicated in blue) or captive (indicated in red) doucs and fed a high- or low-fiber diet. Each pair of square boxes indicates a single isolator with four male and four female germ-free mice for a total of four isolators. Reported in (c) are total species and overlapping species recovered from fecal samples collected on day 49 prior to sacrifice, as well as from the Wild and Captive FMT donor pools. Abbreviations: Captive High (CH), Captive Low (CL), Wild High (WH), Wild Low (WL), Wild FMT Donor pool (WD), Captive FMT Donor pool (CD).