The present study was conducted to evaluate the effects of fennel hydroalcoholic extract and chelated manganese-glycine on performance and bone status in broiler chickens. A total of 360 of day-old Arbor Acres broilers were randomly arranged according to a completely randomized experimental design (CRD) in a 2 × 3 factorial management with 6 treatments 6 replicates and 10 birds each. Treatments consisted of basal diets as control (include corn and soy bean meal), three levels of fennel (0, 100, or 200 mg/kg diet), and two levels of chelated manganese-glycine (0 or 150 mg/kg diet). Two similar weight of broilers were selected in each replicate and sacrificed by neck dislocation then tibia bones were removed, and freeze-dried and carcass yield and relative weights of internal organs were expressed as the percentages of live body weight. The results have shown that broiler performance was not affected (P>0.05) by the supplementation of fennel extract and chelated manganese glycine (150 mg/kg) in broilers diet but increased the tibia manganese content in this respect. However, the bone manganese reduced significantly (P<0.05) by fennel hydroalcoholic extract at 42 days of age. The result of this study has suggested that improved broiler tibia manganese content by manganese chelated-glycine supplementation.
