. 2018 Nov 30;97(1):43–54. doi: 10.1093/jas/sky416

Table 2.

Effects of line (LRFI vs. HRFI¹) and diet sequence (control vs. complex) on ADG, ADFI, and G:F of weaned pigs

		LRFI⁵		HRFI⁵		P-value⁴
Traits²	n ³	Control	Complex	Control	Complex	SEM	Line	Diet	L × D
BW, kg
Birth	264	1.49^ab	1.51^b	1.42^a	1.41^a	0.016	0.009	0.81	0.68
Day 0	264	8.95^abc	8.83^bc	8.24^a	8.46^ab	0.072	<0.001	0.74	0.23
10 wk	259	23.40	23.88	23.98	24.33	0.218	0.22	0.36	0.88
	161⁶	23.30	23.75	23.90	23.73	0.289	0.60	0.80	0.57
23 wk	161⁶	94.90^a	96.46^a	98.89^b	102.18^b	0.817	0.003	0.13	0.59
ADG, g/d
Days 0 to 42	259	353^a	367^ab	384^b	386^b	5	0.005	0.43	0.49
Days 0 to 6	263	87^a	92^a	153^b	166^b	5	<0.001	0.37	0.70
Days 6 to 19	260	290^a	356^b	318^ab	349^b	7	0.45	<0.001	0.18
Days 19 to 42	258	484^ab	471^a	511^b	490^ab	6	0.067	0.20	0.78
Growing–finishing⁷	161	880^a	890^a	919^ab	957^b	9	<0.001	0.11	0.32
ADFI, g/d
Days 0 to 42	12	611^a	639^ab	679^b	683^b	15	0.017	0.42	0.53
Days 0 to 6	12	151^a	169^ab	203^bc	221^c	8	0.004	0.22	0.98
Days 6 to 19	12	324^a	363^ab	396^b	408^b	10	0.005	0.16	0.39
Days 19 to 42	12	905	932	981	976	23	0.089	0.75	0.60
Growing–finishing	161	1,933^a	2,012^a	2,284^b	2,348^b	24	<0.001	0.090	0.86
G:F
Days 0 to 42	12	0.580	0.578	0.569	0.566	0.006	0.40	0.86	0.98
Growing–finishing	161	0.461^b	0.448^b	0.404^a	0.410^a	0.004	<0.001	0.63	0.16

^abcFor a given day, means with different letters differed (P < 0.05) across treatments (line × diet combinations).

¹LRFI = line selected for low residual feed intake; HRFI = line selected for high residual feed intake.

²Day 0 = weaning day (average 28 d of age); day 6 = 6 d after weaning; day 19 = 19 d after weaning; day 42 = 42 d after weaning, 10 wk of age, end of the postweaning period.

³Number of measurements with pigs or pens as statistical unit.

⁴ P-value of the fixed effects in linear models containing the batch, the dietary sequence (D), the sex (for individual measurements), the line effects (L), and the interaction between line and dietary sequence (L × D) applied to each period of time independently.

⁵Line of pigs divergently selected for low or high residual feed intake (LRFI or HRFI). Least square means of the line × dietary sequence interaction are presented. Values with different superscripts within a row differed (P < 0.05).

⁶Pigs with individual feed intake measurements during the growing–finishing period.

⁷From 10 to 23 wk of age.