Table 1 Effects of feed restriction on the body weight and tissue weight of broilers (unit: g).

Age	Group^a	Body weight^b	Heart weight^c	Liver weight^c	Pectoralis weight^c	Leg muscle weight^c
21 d	Control	824.13 ± 11.55^a	5.37 ± 0.21^ab	20.93 ± 0.63^b	147.23 ± 4.40^a	102.28 ± 3.84^a
	QR	474.13 ± 6.80^d	2.81 ± 0.05^c	11.49 ± 0.45^d	65.31 ± 2.21^c	57.80 ± 1.74^b
	ER	730.50 ± 685^c	4.69 ± 0.24^ab	16.56 ± 0.88^c	131.85 ± 4.18^b	92.37 ± 3.04^a
	PR	789.13 ± 7.16^b	7.20 ± 1.30^a	25.03 ± 2.19^a	138.10 ± 4.91^ab	100.07 ± 4.15^a
42 d	Control	2519.25 ± 67.27^a	9.54 ± 0.67	49.51 ± 3.70	525.60 ± 2.86	384.45 ± 14.62
	QR	2318.50 ± 69.38^b	9.75 ± 0.63	44.30 ± 2.59	455.37 ± 16.00	357.22 ± 13.43
	ER	2371.75 ± 53.29^ab	8.99 ± 0.88	42.94 ± 2.02	492.85 ± 29.07	356.35 ± 15.41
	PR	2341.12 ± 56.45^ab	10.24 ± 0.48	49.00 ± 1.82	502.62 ± 25.59	362.90 ± 13.57

Note: ^a-ddifferent lowercase letters in different groups of the same age indicate P < 0.05.
^aIn 8–21 d, the control group was fed a conventional diet ad libitum, the QR group was fed a conventional diet between 8:00–13:00, the ER group was fed a 15% energy-restricted diet, and the PR group was fed a 15% protein-limited diet. At 22–42 d, the four groups of broilers were transferred to the same conventional diet ad libitum.
^bBody weight refers to the average live weight of each group of broilers (n = 20).
^cTissue weight refers to the tissue weight of the slaughtered broilers (n = 3).

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