1. Introduction
  1.1 Background
  1.2 Significance of the Study
  1.3 Research Objectives

2. Literature Review
  2.1 Definition and Types of Dietary Fiber
  2.2 Role of Dietary Fiber in Digestive Health
  2.3 Effects of Dietary Fiber on Gut Microbiota
  2.4 Impact of Dietary Fiber on Nutrient Digestibility
  2.5 Influence of Dietary Fiber on Intestinal Morphology
  2.6 Relationship between Dietary Fiber and Immune Function

3. Methodology
  3.1 Experimental Design
  3.2 Animal Selection and Housing
  3.3 Dietary Fiber Sources
  3.4 Measurement of Gut Microbiota Composition
  3.5 Evaluation of Nutrient Digestibility
  3.6 Assessment of Intestinal Morphology
  3.7 Analysis of Immune Function

4. Results
  4.1 Gut Microbiota Composition
  4.2 Nutrient Digestibility
  4.3 Intestinal Morphology
  4.4 Immune Function

5. Discussion
  5.1 Comparison of Different Dietary Fiber Sources
  5.2 Implications of Findings on Digestive Health
  5.3 Limitations of the Study
  5.4 Future Research Directions