Two-Stage Fermented Feather Meal Enhances Growth Performance and Amino Acid Digestibility in Broilers

The study aimed to investigate the dose tolerance of enzymatically degraded feather meal (EFM) in diet, and effect two-stage fermented on growth performance amino acid digestibility broilers. In trial 1, 160 one-day-old broilers were randomly assigned into 0, 10, 15, 20% EFM groups. 2, control, 10% EFM, Bacillus subtilis var. natto N21 + B. coagulans L12 (BBEFM), Saccharomyces cerevisiae Y10 (BSEFM) Trial 3 involved 32 twenty-one-day-old male nitrogen-free highly digestible protein, BSEFM groups for a 7-day metabolic trial. During all feeding periods, increasing dosage diet linearly quadratically inhibited weight gain (WG), feed intake, conversion ratio (FCR) (p < 0.05), except FCR at 22–35 days > 0.05). Dietary inclusion more than 15% resulted negative impact over 1–35 Therefore, broiler is 10%. WG, FCR, production efficiency factor group better those control apparent standardized ideal was higher 3, Met, Cys, Trp conclusion, Bacillius S. fermentation can improve enhance performance.