Abstract
This study was conducted to evaluate the effects of different sources and contents of dietary Mn on growth performance, carcass characteristics, meat quality, immune response, bone characteristics, and Mn deposition of tibia in broiler chickens. A total of 600 one-day-old male broiler chickens were assigned to the basal diet (control) + a 3 × 3 factorial arrangement of treatments with 5 cages per treatment and 12 broiler chickens per cage. Treatments were included control or control supplemented with 60, 90, or 120 mg Mn/kg from each Mn source [Mn-sulphate, Mn-proteinate, and nanoparticle of Mn (nano-Mn)]. The results indicated that the broiler chickens fed the control diet had greater weight gain, white blood cell and lower breast percentage as compared to the broiler chickens receiving diets containing Mn supplementations (P < 0.05) during d 0 to 42. Broiler chickens fed the diet containing 120 mg nano-Mn/kg had lower liver percentage (P < 0.05) as compared to the broiler chickens fed the other diets. The greater heart percentage was observed in broiler chickens fed the diets containing nano-Mn as compared to broiler chickens fed the Mn-proteinate (P < 0.05). The greater heterophil to lymphocyte ratio was observed in blood of broiler chickens fed the diet containing nano-Mn as compared to broiler chickens fed the diet containing Mn–sulphate (P < 0.05). The lower malondialdehyde concentration in muscles was observed in broiler chickens fed the diets containing nano-Mn after 3 d of storage in refrigerator as compared to other sources (P < 0.05). Malondialdehyde concentration in thigh meat decreased with increasing dietary Mn content after 3 and 6 d of storage in refrigerator (P < 0.05). Broiler chickens fed the diets containing nano-Mn and Mn-proteinate had greater crude protein percentage in breast muscle as compared to broiler chickens fed the diet containing Mn-sulphate (P < 0.05). Physical traits of tibia bone were neither influenced by the dietary added Mn nor by the sources of Mn. Our data indicated that addition of Mn as nano-Mn in the diet of broiler chickens decreased lipid oxidation of meat, and increased pH values, crude protein percentage of meat, and heart percentage. However, dietary nano-Mn increased stress in broiler chickens through increased the heterophil to lymphocyte ratio. Broiler chickens fed the diets supplemented with Mn had better percentages of breast, meat quality, and Mn concentration of tibia than broiler chickens fed the control diet.
Published Version
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