Table 4.

Effect of feeding program and genetic line on the body composition 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	16	15	16	24	23	-	FP	GL	FP×GL
Day 0 (initial condition)
Average BW, kg	29.98	29.57	30.30	29.53	30.20	2.14	0.74	0.08	0.95
Lean Mass, kg	25.58	25.35	25.43	25.30	25.66	1.38	0.23	0.11	0.44
Fat Mass, kg	4.09	4.23	4.17	4.02	4.25	1.28	0.33	0.18	0.50
Backfat thickness, mm	8.62	8.66	8.65	8.86	8.45	0.89	0.98	0.34	0.83
Loin depth, mm	34.86	36.43	34.52	36.25	34.27	3.62	0.26	0.21	0.33
Day 35
Average BW, kg	57.78	58.53	59.71	57.27	60.08	4.63	0.18	0.07	0.31
Lean Mass, kg	48.03	48.32	49.61	47.72	49.59	3.09	0.32	0.09	0.82
Fat Mass, kg	8.68b	9.52a	9.58a	8.77	9.69	3.14	0.02	<0.01	0.54
Backfat thickness, mm	11.19	11.92	12.31	11.75	11.87	1.29	0.39	0.82	0.96
Loin depth, mm	47.63	51.45	51.15	50.77	49.34	3.88	0.12	0.48	0.81
Body tissue gain (0 to 35 d)
Lean mass gain, % BW gain	80.76	80.10	81.31	80.28	80.99	3.72	0.14	0.12	0.56
Fat mass gain, % BW gain	16.27b	18.25a	17.89a	16.93	17.94	2.25	0.03	0.02	0.65
Energy retained, MJ/d	8.29	9.06	9.31	8.33	9.65	1.76	0.17	<0.01	0.53
NE intake MJ / Energy retained MJ	1.85	1.94	1.96	1.93	1.86	2.39	0.24	0.65	0.72
Day 70
Average BW, kg	89.71	92.08	94.01	89.20	94.66	7.23	0.06	<0.01	0.07
Lean Mass, kg	74.08	74.67	76.28	73.32	76.33	5.14	0.18	0.14	0.33
Fat Mass, kg	14.22b	16.67a	16.36a	14.57	16.93	2.12	<0.01	<0.01	0.81
Backfat thickness, mm	14.28b	15.98ab	16.44a	14.77	16.37	3.08	0.02	0.03	0.92
Loin depth, mm	65.29	66.45	66.20	67.88	64.09	3.36	0.65	0.03	0.60
Body tissue gain (36 to 70 d)
Lean mass gain, % BW gain	79.50	79.29	78.17	78.18	79.17	3.71	0.12	0.09	0.60
Fat mass gain, % BW gain	18.00b	20.52a	19.21a	18.10	20.92	2.69	0.04	0.01	0.48
Energy retained, MJ/d	10.86	11.19	11.33	10.00	11.26	1.08	0.21	<0.01	0.65
NE intake MJ / Energy retained MJ	1.70	1.82	1.91	1.70	1.92	3.01	0.31	<0.01	0.46
Total period (0 to 70 d)
Initial BW, kg	29.98	29.57	30.30	29.53	30.20	2.14	0.74	0.08	0.95
Final BW, kg	89.71	92.08	94.01	89.20	94.66	7.23	0.06	<0.01	0.07
Lean mass gain, % BW gain	80.86	79.14	80.06	79.88	82.04	2.03	0.10	0.04	0.39
Fat mass gain, % BW gain	17.52b	19.62a	18.87a	17.21	20.02	3.96	0.04	<0.01	0.72
Energy retained, MJ/d	9.57	9.93	10.12	9.09	10.22	1.06	0.18	0.03	0.95
NE intake MJ / Energy retained MJ	1.80	1.87	1.94	1.85	1.90	3.69	0.11	0.69	0.54

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).