Effects of Dietary 5-Aminolevulinic Acid Supplementation on Laying Performance, Immune Function, Intestinal Microbiota, and Serum Metabolomics in Laying Hens
5-Aminolevulinic acid (5-ALA), a naturally occurring non-proteinogenic amino acid and a key precursor in heme biosynthesis, has attracted increasing attention as a potential functional feed additive in animal production. This study investigated the effects of dietary 5-ALA supplementation on 960 Fengda No. 1 laying hen...