Anaerobic digestion of chicken manure produces both biogas and an organic fertilizing product, the composition of which depends on the properties of the feedstock, digestion conditions, and separation of the material into process fractions. This study aimed to determine the physicochemical and agrochemical properties of products obtained from the anaerobic digestion of chicken manure, identify patterns in the distribution of macro- and micronutrients among process fractions, and assess their agroecological potential. The study was conducted at the industrial Biogas Ladyzhyn facility (Vinnytsia Oblast, Ukraine). Raw chicken manure, products obtained after separation and digestion, the post-digestion product, and the solid fraction were analyzed. The measurements included pH, organic matter, total and ammonium nitrogen, P₂O₅, K₂O, MgO, CaO, SO₃, B, Fe, Mn, Cu, and Zn. The liquid digestate was slightly alkaline (pH 8.4–8.7) and contained, on average, 1.01% N, 0.97% P₂O₅, 0.81% K₂O, and 0.26% CaO on a fresh-weight basis. On a dry-matter basis, the highest contents of total and ammonium nitrogen were recorded in the post-digestion product, at 18.6% and 7.7%, respectively. The maximum P₂O₅ and K₂O contents were 5.5% and 9.7%, respectively. In the post-digestion product, Zn, Cu, and Fe concentrations reached 1,509.7, 296.8, and 623.2 mg/kg dry matter, respectively, whereas Mn concentrations were lower than those in the raw manure. These findings indicate that anaerobic digestion is accompanied by the selective redistribution of nutrients and micronutrients among process fractions. The observed compositional differences characterize the agroecological potential of biogas production by-products and are important for assessing their subsequent use as organic fertilizing products.