Table 2.

Body weight (BW), food intake (FI), and food conversion ratio (FCR) in low (L) and normal (N) birth weight (BiW) pigs food restricted for 21 days (FR; age 80–100 day) and subsequently refed (RFD) ad libitum (R), and in pigs fed ad libitum throughout the experimental period (C)

	N		L		P valuee
	C	R	C	R	BiW	Feeding type
BW (kg) at age
1 day; birth	1.5b ± 0.02		1.1a ± 0.03		<0.001
28 days; weaning	9.0b ± 0.26		6.9a ± 0.27		<0.001
79 days; prior to FR	29.6b ± 0.60		24.9a ± 0.66		<0.001
90 days; during FR	36c ± 1.0	34bc ± 1.0	31ab ± 1.1	29a ± 1.1	<0.001	0.070
101 days; begin RFD	43c ± 1.1	39bc ± 1.1	38ab ± 1.2	34a ± 1.2	<0.001	0.003
131 days; end of RFDf	71b ± 1.8	69ab ± 1.8	67ab ± 2.0	62a ± 2.0	0.012	0.061
Absolute FI (g/d) at age
28 days; weaning	306b ± 9		270a ± 9		<0.001
79 days; prior to FR	1307b ± 55		1163a ± 60		0.021
90 days; during FR	1448b ± 35	825a ± 35	1397b ± 38	825a ± 38	0.486	<0.001
101 days; begin RFD	1653 ± 47	1690 ± 47	1645 ± 51	1510 ± 51	0.056	0.321
130 days; end of RFD	2521 ± 77	2569 ± 77	2518 ± 90	2546 ± 80	0.870	0.644
FI related to BW (g/kg BW)
28 days; weaning	34a ± 2.0		41b ± 2.2		0.006
79 days; before FR	44 ± 2.1		47 ± 2.3		0.162
90 days; during FR	40c ± 1.0	24a ± 1.0	45d ± 1.1	29b ± 1.1	<0.001	<0.001
101 days; begin RFD	39a ± 1.0	43b ± 1.0	43b ± 1.1	44b ± 1.1	0.032	0.012
130 days; end of RFD	37a ± 1.2	40ab ± 1.2	40ab ± 1.4	41b ± 1.3	0.038	0.043
FCR (kg FI/kg BW gain)
28–79 days; prior to FR	2.04 ± 0.05		1.97 ± 0.05		0.334
80–90 days; during early FR	2.50b ± 0.09	2.23ab ± 0.09	2.12a ± 0.10	2.12a ± 0.10	0.008	0.162
91–100 days; during late FR	2.46b ± 0.06	1.67a ± 0.06	2.24b ± 0.07	1.67a ± 0.07	0.073	<0.001
101–130 days; during RFD	2.43 ± 0.07	2.40 ± 0.07	2.31 ± 0.08	2.23 ± 0.08	0.075	0.459

Values are LSM ± SE (n = 9–12/group)

^a–dWithin a row, LS means without a common superscript differ (P ≤ 0.05, Tukey–Kramer test)

^eA trend for BiW x Feeding type interaction was observed for FI/kg BW on day 101 (P = 0.078) and FCR between days 91 and 100 (P = 0.092); BiW × Feeding type interaction effects for all other variables were not significant (P > 0.1)

^fSlaughter weight