Nutritional Profile and Digestibility of Feather Meal and Mixed Meal in Broiler Chickens

This study evaluated the nutritional composition, nutrient digestibility, and effects on small intestinal morphology of feather meal (100% feather meal) and a mixed meal consisting of 90% feather meal and 10% offal meal. A total of 300 twenty-two-day-old male Ross 308 broilers were randomly allocated into two dietary treatment groups (93% feather meal- or mixed meal-based diets). Each treatment had six replicates of 25 birds in each replication, and the experiment lasted 7 days using a direct feeding approach for nutrient digestibility evaluation. Data were analyzed using the General Linear Model (GLM) of the Statistical Analysis System (SAS), and treatment means were compared using a two-sample t-test (5%). Results showed that feather meal had higher crude protein and gross energy, while mixed meal contained greater ash, crude fiber, and unsaturated fatty acids. Feather meal was rich in methionine and lysine, whereas mixed meal had higher levels of valine, leucine, and serine. Standardized ileal digestibility was higher for fiber and most amino acids in the mixed meal, while protein digestibility and metabolizable energy were similar (p > 0.05) between treatments. Additionally, birds fed the mixed meal exhibited improved intestinal morphology, with greater jejunum and ileum villus height. In summary, the mixed meal showed better digestibility and gut morphology, indicating greater potential as a sustainable protein source.