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The content of IMF (A-B) and TG (C-D) in breast and thigh muscles of ducks under FRS and NRS. a-c indicated a significance (P ＜ 0.05) among 8w-FRS, 8w-NRS, 13w-FRS, and 13w-NRS. Abbreviations: IMF, intramuscular fat; FRS, floor rearing system; NRS, net rearing system; TG, triglyceride; 8w, eight week; 13w, 13th week.
