Table 3.

Effect of feeding program and genetic line on the performance of growing and finishing pigs¹

	Feeding programs2			Genetic Line		RSD3	Statistical Analysis (P-value)4
Item	CON	HF/LP	SEQ	A	B
No. of animals	24	23	26	37	36	-	FP	GL	FP×GL
Growing phase 1 (30 to 45 kg BW; 21 d)
Initial BW, kg	29.7	30.1	29.8	29.5	30.2	1.51	0.52	0.07	0.88
Final BW, kg	45.6	45.5	46.0	44.6	46.8	3.18	0.66	<0.01	0.58
ADFI, kg/d	1.55	1.56	1.63	1.51	1.65	0.22	0.27	0.01	0.95
ADG, kg/d	0.750	0.747	0.771	0.702	0.808	0.13	0.66	<0.01	0.52
Feed efficiency, kg/kg	0.49	0.48	0.47	0.47	0.49	0.81	0.73	0.03	0.33
NE intake, MJ/d	13.78b	15.50a	16.04a	14.49	15.73	3.04	<0.01	0.01	0.86
Energy cost of gain, MJ NE/kg gain	18.66b	20.96a	20.89a	20.82	19.52	2.37	<0.01	0.03	0.41
Growing phase 2 (45 to 75 kg BW; 28 d)
Initial BW, kg	45.6	45.5	46.0	44.6	46.8	3.91	0.66	<0.01	0.58
Final BW, kg	72.8	74.1	75.5	71.8	76.4	2.92	0.12	<0.01	0.54
ADFI, kg/d	1.94	2.05	2.11	1.87	2.20	0.20	0.15	<0.01	0.98
ADG, kg/d	0.974b	1.016ab	1.052a	0.974	1.054	0.17	0.04	<0.01	0.60
Feed efficiency, kg/kg	0.51	0.50	0.50	0.53	0.48	0.27	0.94	<0.01	0.59
NE intake, MJ/d	17.69b	20.58a	19.94a	17.76	21.05	3.14	<0.01	<0.01	0.93
Energy cost of gain, MJ NE/kg gain	17.96b	20.09a	18.86b	17.70	19.84	2.16	<0.01	<0.01	0.97
Finishing phase (75 to 105 kg BW; 35 d)
Initial BW, kg	72.8	74.1	75.5	71.8	76.4	3.44	0.12	<0.01	0.54
Final BW, kg	104.1	108.4	108.2	102.6	111.2	8.01	0.08	<0.01	0.56
ADFI, kg/d	2.17b	2.40a	2.27ab	2.12	2.44	0.38	0.02	<0.01	0.91
ADG, kg/d	0.904b	0.982a	0.937ab	0.885	0.997	0.17	0.04	<0.01	0.63
Feed efficiency, kg/kg	0.42	0.41	0.42	0.42	0.41	0.20	0.86	0.37	0.27
NE intake, MJ/d	19.39c	24.04a	21.61b	20.03	23.34	2.91	<0.01	<0.01	0.69
Energy cost of gain, MJ NE/kg gain	21.64b	24.52a	23.07ab	22.17	23.32	2.12	<0.01	0.10	0.73
Total experiment (84 d)
Initial BW, kg	29.7	30.1	29.8	29.5	30.2	1.51	0.52	0.07	0.88
Final BW, kg	104.1	108.4	108.2	102.6	111.2	8.01	0.08	<0.01	0.56
ADFI, kg/d	1.89	2.01	2.00	1.84	2.10	0.56	0.12	<0.01	0.99
ADG, kg/d	0.874	0.918	0.920	0.854	0.943	1.12	0.16	<0.01	0.54
Feed efficiency, kg/kg	0.47	0.47	0.46	0.47	0.46	0.24	0.82	0.41	0.29
NE intake, MJ/d	16.91b	20.11a	19.20a	17.20	20.21	3.91	<0.01	<0.01	0.88
Energy cost of gain, MJ NE/kg gain	19.15b	21.85a	20.94a	20.22	20.96	1.02	<0.01	<0.01	0.22

¹Initial weight as a covariate was significant for all variables; P < 0.01.

²CON: control diet from 0000 to 2359 h; HF/LP: high-fat/low-crude protein diet from 0000 to 2359 h; sequential feeding (SEQ): 1800 to 1000 h control diet and 1001 to 1759 h high-fat/low-crude protein diet.

³Residual Standard Deviation.

⁴Data were analyzed using a linear MIXED model including the fixed effects of covariate, feeding program (FP; n=3), genetic line (GL; n=2), and the interaction between FP and GL (FP×GL). The repeated measurements option was used with a compound symmetry covariance structure to account for experimental unit effect over the experimental period.

^{a, b, c} Within a row, means with different superscripts are affected by feeding system (P < 0.05).