L-Lysine sulphate, a feed additive produced by fermentation with a genetically modified strain of Escherichia coli CGMCC 3705, serves as an efficacious source of the amino acid L-lysine for all animal species. Neither the production strain nor its recombinant DNA was detected in the final product1. It plays a crucial role in animal nutrition, supporting growth, health, and overall well-being. For supplemental L-lysine sulphate to be as efficacious in ruminants as in non-ruminants, it should be protected from ruminal degradation using appropriate technologies