Figure 6

Effects of feed restriction on the mtDNA copy number of 42 d broilers in different tissues. (A) Heart; (B) liver; (C) pectoralis; (D) leg muscle. mt/nucDNA= mtDNA relative to nuclear DNA (GCG) copy number. P _group = 0.002; P _group × _tissue = 0.472. Different letters indicate P < 0.05, and the same or no letter indicates P > 0.05. The control group was fed a conventional diet ad libitum, the QR group was fed a conventional diet between 8:00–13:00 from 8–21 d, the ER group was fed a 15% energy-restricted diet ad libitum from 8–21 d, and the PR group was fed a 15% protein limited diet ad libitum from 8–21 d. n = 3.