Overview
Valine is an essential branched-chain amino acid (BCAA) and ranks as the 4th limiting amino acid in typical corn-soybean poultry diets, following methionine, lysine, and threonine. Because poultry cannot synthesize it internally, it must be provided through feed to maintain protein synthesis and skeletal growth.
Limitations & Usage Tips
- BCAA antagonism — valine shares metabolic enzymes with leucine and isoleucine. Excess leucine (common in corn-heavy diets) breaks down valine and isoleucine, causing induced deficiencies.
- Use crystalline L-Valine to reduce total crude protein in low-protein formulations while maintaining performance.
- Natural sources: blood meal (up to 8.5%), fish meal, and soybean meal.
Key Benefits
- Protein synthesis — primary building block for tissues; significantly influences muscle development and lean meat yield in broilers.
- Feather & bone health — adequate valine is essential for proper feather development and bone mineralization. Deficiencies are linked to brittle feathers and leg abnormalities.
- Immune function — supports antibody production; a 16–50% deficiency reduces antibody titers and increases disease susceptibility.
- Metabolic energy — as a glucogenic amino acid, it converts to glucose to provide extra energy under stress.
Recommended Inclusion Rates
| Starter (0–3 weeks) | Total 0.90% · Val:Lys 0.77–0.86 |
|---|---|
| Grower (3–6 weeks) | Total 0.82% · Val:Lys 0.76–0.84 |
| Finisher (6–8 weeks) | Total 0.70% · Val:Lys 0.75–0.78 |
| Laying hens | Total ~0.70% · Val:Lys 0.92–0.93 |