Crude Protein Requirements for Livestock Crude Protein Requirements for Livestock Livestock Type Category Stage/Production Crude Protein Requirement (%) Poultry Broilers Starter (0–3 weeks) 22–24% Grower (3–6 weeks) 20–22% Finisher (6–8 weeks) 18–20% Layers Starter (0–6 weeks) 18–20% Grower (6–18 weeks) 15–16% Laying hens (18+ weeks) 16–18% Swine Piglets Pre-starter (3–5 kg) 24–26% Starter (5–10 kg) 20–22% Grower Pigs 10–50 kg...