Effect of supplemental manganese and source on carcass traits, meat quality, and lipid oxidation in broilers

¹ Mineral Nutrition Research Division, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100094, P. R. China; and State Key Laboratory of Animal Nutrition, Beijing 100094, P. R. China
² Chinese Academy of Agricultural Sciences, Mineral Nutrition Research Division, Institute of Animal Science, Beijing, China

^* To whom correspondence should be addressed. E-mail: wlysz{at}263.net.

	Abstract

An experiment was conducted using a total of 336 1-d-old Arbor Acres commercial male broilers to investigate the effect of dietary Mn supplementation on carcass traits, meat quality, and lipid oxidation, relative enzyme activities in abdominal fat and meat, and MnSOD mRNA level in meat. Broilers were randomly allotted by BW to 1 of 8 replicate cages (6 chicks per cage) for each of 7 treatments in a completely randomized design involving a 2 x 3 factorial plus 1 arrangement of treatments. Dietary treatments included the corn-soybean meal based diet (Control) and the basal diet supplemented with 100 or 200 mg Mn/kg as Mn sulfate (MnSO4·H₂O), Mn amino acid A (Mn AA A) with a chelation strength of 26.3 formation quotient (Qf) (8.34% Mn), or Mn amino acid B (Mn AA B) with a chelation strength of 45.3 Qf (6.48% Mn). Birds fed supplemental Mn had lower (P < 0.10) percentages of abdominal fat, lipoprotein lipase (LPL) and malate dehydrogenase (MDH) activities and greater (P < 0.07) hormone sensitive lipase (HSL) activities in abdominal fat than birds fed a Control diet. Birds fed supplemental Mn from Mn AA A or Mn AA B had lower (P < 0.05) LPL activities in abdominal fat than those fed supplemental MnS04·H₂O. Birds fed supplemental Mn had lower (P < 0.03) malondialdehyde (MDA) content in leg muscle and greater (P < 0.02) Mn-containing superoxide dismutase (MnSOD) activities and MnSOD mRNA level in breast or leg muscle than those fed the Control diet. Birds fed supplemental Mn from Mn AA A had greater (P < 0.02) MnSOD mRNA level in leg muscle than those fed supplemental MnS04·H₂O. Results from this study indicated that organic Mn was more available than inorganic Mn in decreasing LPL activity in abdominal fat of broilers, and dietary Mn might reduce abdominal adipose deposition by decreasing LPL and MDH activities or increasing HSL activity in abdominal adipose tissue. Results also indicated that dietary Mn upregulated muscle MnSOD gene expression pretranslationally. Furthermore, the decrease of MDA content in leg muscle because of supplemental Mn might be related to the increase of MnSOD activity resulting from upregulation of MnSOD gene expression pretranslationally in leg muscle.

Key Words: Carcass traits, Dietary manganese, Lipid oxidation, Meat quality, MnSOD activity, MnSOD mRNA level

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