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 freezedried 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.
