<![CDATA[Fatiah, F. N., Krismiyanto, L., & Yunianto, V. D. (2025). Relative Weight of Lymphoid Organs in Broiler Chickens with High Stocking Density Due to the Addition of Microencapsulated Parijoto Fruit Extract–Lactobacillus plantarum in the Diet. In: Herlinda S et al. (Eds.), Prosiding Seminar Nasional Lahan Suboptimal ke-13 Tahun 2025, Palembangg 20 Oktober 2025. (pp. x–y). Palembang: Penerbit & Percetakan Universitas Sriwijaya (UNSRI).This study aimed to evaluate the effect of adding microencapsulated Parijoto fruit extract–Lactobacillus plantarum (MEBPLp) to the diet on the relative weight of lymphoid organs in broiler chickens reared under high stocking density. A total of 308 unsexed Ross strain broilers aged 8 days with an average body weight of 208.42 g were used. The Parijoto fruit extract served as a phytobiotic containing bioactive compounds such as flavonoids, while Lactobacillus plantarum acted as a probiotic to support intestinal health and immune function. The basal diet was composed of ground corn, rice bran, soybean meal, fish meal, limestone, premix, lysine, and methionine. The experiment was arranged in a completely randomized design (CRD) with three treatments and seven replications, resulting in 21 experimental units. The treatments consisted of T0 (normal density 10 birds/m² without MEBPLp), T1 (high density 17 birds/m² without MEBPLp), and T2 (high density 17 birds/m² with 0.6% MEBPLp). Parameters measured included the relative weights of the bursa of Fabricius, spleen, and thymus. Data were analyzed using analysis of variance (ANOVA) at a 5% significance level, and significant results were further tested using Duncan’s multiple range test. The results showed that the addition of 0.6% MEBPLp significantly (p<0.05) affected the relative weights of the bursa of Fabricius and thymus but had no significant effect (p>0.05) on the spleen. It can be concluded that the inclusion of 0.6% MEBPLp in the diet improved the relative weights of immune organs such as the bursa of Fabricius and thymus in broilers reared under high stocking density, indicating a synergistic effect of phytobiotics and probiotics in enhancing poultry immune responses.]]>
