The main components of animal feed are corn or soybean meal, but these basic diets do not contain enough lysine and methionine to meet the animal's growth needs. To promote animal growth, reproduction, and metabolism, lysine and methionine feed additives need to be added to the feed. At the same time, other vitamins, trace elements, and other feed additives should be added to promote comprehensive and balanced nutrition.
This article mainly explains the application of lysine and methionine in feed during the breeding process, providing reference ideas for standardized breeding and feed formulation optimization.
1. Core Physiological Functions of Lysine And Methionine
Amino acids are the essential building blocks of protein. Lysine and methionine are the two most commonly used amino acids in feed and are often used together as essential feed additives for providing precise nutrition to animals.
1.1 Lysine – Promotes Growth And Reproduction
Lysine is the first limiting amino acid for pigs and aquatic animals. Animals cannot produce it themselves and must obtain it from feed. Adding lysine to feed effectively aids in the growth and development of pigs and aquatic animals, improving meat quality. It also participates in the protein synthesis of skeletal muscle and internal organs, increasing daily weight gain, reducing the feed conversion ratio, and accelerating slaughter. Feed-grade lysine can regulate the ratio of fat to protein deposition, reducing excess fat accumulation in the animal's body and increasing the lean meat percentage and commercial value of the finished product.
Lysine participates in calcium and phosphorus metabolism and the synthesis of immune factors, effectively enhancing animal immunity, promoting bone development, reducing stress response, and decreasing disease incidence. Precise supplementation of lysine in the diet avoids nutritional deficiencies and solves a common pain point in the industry. 98.5% lysine hydrochloride, 70% lysine sulfate, and liquid methionine are available for customers to choose from based on their farming conditions. 98.5% lysine hydrochloride is the mainstream choice, offering high stability and adaptability to various processes and scenarios.
1.2 Methionine – Promotes Metabolism And Improves Quality
Methionine is the first limiting sulfur-containing amino acid in poultry and aquatic animals. Besides providing nutrition, methionine also plays a regulatory role in physiology. During metabolism, methionine provides methyl donors and participates in DNA methylation and protein modification. Simultaneously, to ensure normal physiological function in animals, it also participates in the synthesis of key substances such as creatine and adrenaline. Furthermore, methionine can be converted into glutathione in animals, which has antioxidant and anti-inflammatory properties, helping animals reduce oxidative damage and enhance liver detoxification.
Methionine is one of the most essential nutrients in poultry farming. Poultry feathers rely on sulfur-containing amino acids, and timely and sufficient methionine intake is beneficial for feather growth, resulting in smoother feathers. It also strengthens eggshell thickness and hardness, reducing the rate of broken shells and soft-shelled eggs. Methionine is required for cysteine synthesis, and cysteine can reduce metabolic disorders in animals, decrease the incidence of fatty liver in livestock and poultry, and promote the health and stability of the farmed population.
2. Precise Application of Lysine And Methionine in Various Animal Feeds
Different animals and different growth stages have different requirements for lysine and methionine. Animal nutritionists can develop precise formulas based on the animal's needs at different growth stages, which helps improve the efficiency of feed additives and better utilize the functions of lysine and methionine.
2.1 98.5% Lysine Hydrochloride Is Specifically Designed for Pigs
Lysine is the limiting amino acid for pigs; a deficiency directly impacts normal growth and overall farming efficiency. Piglets, in their peak nutritional stage, have an even higher demand for lysine. Therefore, 0.8%–1.2% feed-grade lysine should be added to their diet. Timely lysine supplementation promotes healthier intestinal development, higher feed intake, and a less pronounced weaning reaction in piglets. During the growth and fattening stages, sufficient lysine in the feed significantly increases daily weight gain, improves protein deposition efficiency, and increases lean meat percentage, thereby enhancing the economic benefits of pig farming.
When feed is precisely formulated, with 98.5% lysine added and other nutrients adequately supplemented, the proportion of soybean meal can be reduced accordingly. This can lower feed ingredient costs and reduce resource waste. Methionine primarily helps maintain the amino acid balance in pigs, ensuring normal and stable metabolism.
2.2 Amino Acid Requirements of Poultry
Poultry farmers are most concerned with achieving rapid market readiness. Adding precise methionine nutrition to poultry feed reduces the negative impact of methionine deficiency on normal growth and development. Methionine, in synergy with lysine, effectively promotes feather development, weight gain, and egg production in laying hens and broilers, while reducing pica issues such as feather pecking and vent pecking during growth. This also improves feed conversion ratio and reduces feed costs.
When the feed contains sufficient methionine, the first limiting amino acid, laying hens have stronger egg production performance and higher egg quality. It also reduces premature aging and feather loss in laying hens, resulting in more stable egg production throughout the breeding cycle and higher economic returns.
2.3 Application of Ruminant and Aquaculture Feeds
Ruminants, such as cattle, horses, and sheep, consume a high amount of feed daily. Nutritional imbalances in their feed lead to slow weight gain and poor meat quality in beef cattle. Under the prevailing low-protein diet, ruminants inevitably suffer from nutritional deficiencies. Adding lysine and methionine to their feed can reduce protein waste and improve farming efficiency, making it an essential choice for large-scale farming.
In high-density intensive aquaculture settings, aquatic animals are prone to stress and disease. Precisely supplementing aquatic feed with appropriate doses of lysine and methionine can promote increased feeding and rapid growth in fish and shrimp, while also reducing water pollution from uneaten feed.
3. The Core Value of Lysine And Methionine in Feed
3.1 Optimize Feed Formulation
Traditional diets high in soybean meal and crude protein often fail to allow animals to fully absorb protein nutrients, resulting in low utilization and high costs. However, by using feed additives and precisely adding appropriate amounts of lysine and methionine, amino acid absorption can be promoted, balancing nutrition. Most experiments have shown that adding lysine and methionine to feed increases protein utilization by 10%+. Therefore, adding lysine and methionine is the wisest choice for reducing costs and increasing efficiency.
3.2 Improve Finished Product Quality
Animal husbandry aims to meet the market's food safety demands. When animals are nutritionally balanced, the quality of their meat, eggs, and dairy products is superior. Lysine primarily improves meat yield and lean meat percentage, while methionine mainly enhances egg quality. Their synergistic effect promotes healthy animal growth, resulting in finished products with superior appearance and taste, making them more competitive.
3.3 Green And Environmentally Friendly Aquaculture
Animals cannot fully absorb the nitrogen in high-protein diets, which enters the environment through excrement, causing soil pollution. When animals are supplemented with lysine and methionine in a timely manner, their nutrition becomes balanced, and all beneficial components are absorbed. This reduces nitrogen excretion and lowers ammonia and methionine emissions. This aligns with global environmental protection concepts, promotes green farming, and ensures long-term development.
4. Scientific Application
China has always valued balance; too much or too little is detrimental. In practical applications, precise proportions must be made based on the animal's growth patterns and actual needs. Industry standards and formulation guidelines from various countries are for reference; for detailed advice, please contact your local technical advisor or feed supplier.
In daily use, feed storage is also crucial. Feeds fortified with lysine and methionine should be kept away from prolonged mixing with strongly alkaline substances to prevent nutrient loss. Proper feed storage management is also essential; the feed should be kept dry and protected from light to prevent amino acid oxidation and loss.
Methionine and lysine are important in daily animal feeding, and many customers also frequently ask about threonine and tryptophan. These two amino acids are also common feed additives, which can reduce group fighting and stress, promote growth, and work synergistically with lysine and methionine to promote balanced nutrition in animals.
FAQ
Q1: Does lysine undergo hydrolysis?
A1: Lysine is an amino acid and typically does not undergo the typical hydrolysis seen in proteins or esters. It is relatively stable under suitable conditions, but high temperatures, strong acids, or strong bases may cause it to degrade or react with other substances.
Q2: Is lysine acidic or basic?
A2: Lysine is a basic amino acid because its side chain contains an extra amino group (ε-amino group), giving it a strong basicity.
Q3: What is lysine-glycine magnesium?
A3: Lysine-glycine magnesium is an organic magnesium supplement, typically formed by magnesium coordinating with lysine and glycine to form a coordination/chelate structure. It can be used to supplement magnesium and has good stability and bioavailability.
Q4: What foods are richest in methionine?
A4: Animal foods are generally rich in methionine, with Brazil nuts, fish, meat, eggs, and dairy products being good sources. Among everyday foods, eggs and fish are particularly high in methionine.
Q5: Is methionine hydrophobic or hydrophilic?
A5: Methionine is a hydrophobic amino acid. Its side chains contain sulfur, but it is generally uncharged and has strong hydrophobic properties, so it usually tends to be distributed inside proteins.
Conclusion
Global food demand is increasing daily, making refined and large-scale farming an inevitable trend. For the sake of balanced animal nutrition and sustainable green development, feed additives still hold enormous market potential. Lysine, methionine, threonine, and tryptophan will continue to play an irreplaceable and highly effective role in feed. Polifar is a Chinese supplier of feed and food additives. If you have any further questions or suggestions, please leave a comment, and we will reply as soon as possible.