Optimizing the crystallin amino acid levels in the composition of poultry and swine feeds is critical for maximizing feed efficiency and growth performance (Parsons et al., 2012). Research indicates that methionine and cysteine are often the first limiting amino acids in poultry diets, and their adequate inclusion enhances feed conversion ratios (FCR) (De Groote et al., 2014). In swine nutrition, lysine remains the most critical amino acid, with optimal levels directly correlated to improved feed efficiency (Nielsen et al., 2018).
Determining the precise optimal levels involves balancing amino acid ratios to meet the animals’ requirements without excess, which can lead to inefficient nitrogen utilization (Baker & Parsons, 2014). Recent studies suggest that the ideal digestible methionine in broiler feeds should be approximately 0.48-0.52% of the diet, depending on age and production stage (Rama Rao et al., 2017). For swine, maintaining lysine levels around 0.9-1.2% in the diet optimizes growth and feed efficiency (Kim et al., 2019). Excess amino acids can increase nitrogen excretion, negatively impacting environmental sustainability and feed cost (Ortiz et al., 2020). Hence, formulating diets with crystallin amino acid (like L-lysine, D,L-methionine and L-threonine) levels aligned to these optimal ranges enhances nutrient utilization and economic returns (Emmans, 2001).
Incorporating crystalline amino acids to precisely meet these requirements allows for reduced crude protein levels without compromising performance (López et al., 2016). Continued research integrating amino acid digestibility and genetic improvements will further refine these optimal levels for different breeds and production systems (Miller & Parsons, 2020). Overall, tailoring crystallin amino acid content is essential for sustainable and efficient poultry and swine production (FAO, 2019).
Conclusion
Promois International (www.promoisinternational.com) is one of the best-known manufacturers of the mentioned amino acid.
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