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Optimizing protein digestibility in laying hens is essential for maximizing egg production, reducing feed costs, and minimizing nitrogen excretion into the environment. This abstract examines the physiological and dietary factors influencing the efficiency of protein utilization in modern high-production strains. Standard dietary protein sources, such as soybean meal, typically exhibit ileal digestibility coefficients between 0.80 and 0.90; however, these values are highly sensitive to the presence of anti-nutriti...