Fig. 1

Fast- and slow-fermentation fiber diets exhibit distinct growth performance, nutrient digestibility, GIT fermentation and morphology in goats. A Overview of design and sample collection. B Daily intake and weight gain. C Nutrient digestibility. D SCFA profiles in the rumen, ileum, and cecum. E Inspection of morphology changes in the rumen, ileum, and cecum. FF, fast-fermentation fiber; SF, slow-fermentation fiber. Asterisks denote significant P values, *P < 0.05; **P < 0.01