Table 5.

Effects of the plane of nutrition on growth of finishing pigs born from the sires with a high weight gain potential

	HP Gr1)		MP Gr1)		LP Gr1)			P-value
Item	MP F1), 2)		MP F		LP F1), 3)		SEM	Gr	F	S1)	Gr × F	F × S
	B1)	G1)	B	G	B	G
Initial wt, kg	52.8	47.0	53.7	47.0	45.8	44.5	1.9	0.01	<0.01	<0.01	<0.01	0.10
Days on feed
Phase (P) 1	31	31	30	31	37	37
P 2	38	38	37	37	38	38
Final wt, kg
P 1	82.2	78.3	82.4	76.1	81.8	78.0	2.8	0.95	0.96	0.05	<0.01	0.80
P 2	119.3	111.0	111.4	109.9	121.5	118.3	3.3	0.02	0.01	0.11	<0.01	1.00
ADG
P 1	0.95	1.01	0.95	0.95	0.97	0.91	0.04	0.60	0.50	0.94	<0.01	0.18
P 2	0.97	0.86	0.81	0.91	1.05	1.06	0.04	<0.01	<0.01	0.87	<0.01	0.79
Overall	0.96	0.93	0.88	0.93	1.01	0.98	0.03	<0.01	<0.01	0.95	<0.01	0.35
Days to 115 kg	178.8	186.8	178.2	179.7	180.7	184.5	4.1	0.58	0.72	0.07	<0.01	0.38
Carcass wt, kg	89.3	81.8	84.8	85.2	87.7	86.9	2.1	0.48	0.23	0.13	<0.01	0.51
Dressing, %	74.8	73.7	74.5	75.4	73.9	73.4	0.8	0.33	0.23	0.78	<0.01	0.76
BFT4), mm	21.7	23.3	23.0	25.9	26.5	26.0	1.1	<0.01	<0.01	0.31	<0.01	0.10

¹⁾HP, high plane; MP, medium plane; LP, low plane; Gr, grower; F, finisher; B, barrow; G, gilt; S, sex. Data are least squares means of 10 animals in each plane of nutrition × sex.

²⁾Provided with the MP and LP finisher diets during the finisher phases 1 and 2, respectively (see Table  1). The average ADFI during the phases 1 and 2 were 2.40 kg and 3.96 kg, respectively.

³⁾Provided with the LP finisher during both phases 1 and 2 (see Table  1). The average ADFI during the phases 1 and 2 for the pigs born from both groups of sires with the medium (see Table  4) and high weight gain potentials were 2.89 and 4.10 kg, respectively.

⁴⁾Average of backfat thickness measurements between the 11 and 12th ribs and at the last rib adjusted for a 115-kg liveweight.