DL-Methionine vs L-Lysine: Feed Amino Acids Explained for Poultry and Pigs
Quick answer: DL-methionine and L-lysine are the two most widely used feed amino acids. Methionine is usually the first limiting amino acid for poultry, so DL-methionine is key in chicken feed. Lysine is usually the first limiting amino acid for pigs, so L-lysine is key in pig feed. Adding both lets nutritionists cut crude protein, lower feed costs and improve growth.
Updated October 2026 · NDRG Kokal Enterprise, Sarawak, Malaysia
Key facts
| DL-Methionine purity | 99% min |
|---|---|
| L-Lysine HCl purity | 98.5% min (78.8% lysine) |
| First limiting for poultry | Methionine |
| First limiting for pigs | Lysine |
| Main benefit | Better growth with less crude protein |
| Packing | 25 kg bags |
What are limiting amino acids?
Animals need essential amino acids in the right balance. The “first limiting” amino acid is the one in shortest supply compared with the animal’s needs; it caps growth no matter how much other protein is fed. Supplementing it unlocks better performance.
DL-methionine vs L-lysine
| Feature | DL-蛋氨酸 | L-Lysine HCl |
|---|---|---|
| Purity | 99% min | 98.5% min (78.8% lysine) |
| Main species | Poultry (broilers, layers), fish | Pigs, poultry |
| Key roles | Growth, feathering, egg production, liver health | Muscle growth, lean meat, feed efficiency |
| Main feed partner | Corn–soybean meal diets | Cereal-based pig diets |
| Form | White powder | Light brown granules/powder |
Why poultry need DL-methionine
Corn and soybean meal diets are naturally low in methionine. Chickens need it for growth, feather formation and egg production, so DL-methionine is added to almost every commercial poultry feed. See our feed-grade DL-methionine.
Why pigs need L-lysine
Cereals such as corn, wheat and cassava are low in lysine. Adding L-lysine HCl lets pig farmers reduce expensive protein meals while keeping growth and lean meat yield high.
How amino acids cut feed costs
- Lower crude protein in the diet means less soybean or fish meal per tonne.
- Less excess protein means less nitrogen in manure.
- Better amino acid balance means better feed conversion.
Always work with a nutritionist to set inclusion rates for your animals and ingredients.
Frequently asked questions
What is the difference between DL-methionine and L-lysine?
They are different essential amino acids. DL-methionine is mainly used in poultry feed, while L-lysine is mainly used in pig feed, though both are used in many diets.
Do chickens need lysine as well as methionine?
Yes. Methionine is usually first limiting in poultry, but lysine is often second, so many poultry diets include both.
What purity is feed-grade L-lysine?
Feed-grade L-lysine HCl is typically 98.5% pure, equal to about 78.8% lysine.
Can amino acids reduce feed costs?
Yes. They let you lower total protein in the diet while still meeting the animal’s amino acid needs.
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- Fish Meal Supplier in Malaysia: Grades, Protein Levels and How to Buy in Bulk
- Fish Meal vs Soybean Meal: Which Protein Is Best for Your Animal Feed?
- Best Organic Nitrogen Fertilizers: Blood Meal vs Feather Meal vs Fish Meal
Buy in bulk: request a wholesale quote from NDRG Kokal Enterprise, Siburan, Sarawak. Call or WhatsApp +60 13-739 1922 or email info@ndrgkokalenterprise.com.
Protein Meals · Amino Acids · Fibre · Feed Pellets
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