A recent review in Agriculture (2026) explores how reduced‑protein (RP) diets, along with smart amino‑acid balancing, can make layer production more efficient, economical, and environmentally responsible.
As soybean meal prices rise and nitrogen‑emission regulations tighten, RP diets offer a viable path forward. The article highlights three levers for success:
1) Arginine & its precursors (GAA, Citrulline): Essential for egg formation, reproductive function, bone strength, and metabolic resilience. Citrulline supplementation seems more effective in older hens, improving egg mass and feed intake under RP conditions.
2) Dietary enzymes (phytase, xylanase, β‑glucanase) – critical in low-protein diets: They improve nutrient digestibility, reduce viscosity, enhance phosphorus availability, and support better nitrogen utilization.
3) Energy–protein–AA balance: RP diets only work when energy and amino acids are precisely synchronized. Over‑reduction without full AA profiling (Arg, Ile, Val, Leu) risks performance losses.
Overall, RP diets, when paired with targeted AA supplementation and enzyme inclusion, can maintain productivity, improve nutrient efficiency, enhance skeletal health, and reduce nitrogen excretion, strengthening sustainability in modern layer systems.
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