Table 4.

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

	HP Gr1)		MP Gr1)		LP Gr1)			P-value
Item	HP F1), 2)		HP F1), 2)		LP F1), 3)		SEM	Gr	F	S1)	Gr × F	F × S
	B1)	G1)	B	G	B	G
Initial wt, kg	48.4	52.3	45.7	53.6	43.8	44.2	1.8	<0.01	<0.01	<0.01	<0.01	0.09
Days on feed
Phase (P) 1	28	29	28	28	35	36
P 2	41	39	42	38	46	45
Final wt, kg
P 1	77.1	78.9	73.4	82.7	71.8	72.1	2.2	<0.01	<0.01	0.03	<0.01	0.15
P 2	113.4	111.2	109.8	113.2	116.7	114.2	2.4	0.26	0.12	0.84	<0.01	0.42
ADG
P 1	1.01	0.92	0.99	1.04	0.80	0.77	0.04	<0.01	<0.01	0.58	<0.01	0.65
P 2	0.88	0.85	0.86	0.82	0.98	0.93	0.04	<0.01	<0.01	0.15	<0.01	1.00
Overall	0.94	0.88	0.91	0.90	0.90	0.86	0.03	0.56	0.28	0.11	<0.01	0.71
Days to 115 kg	184.3	182.1	190.5	178.5	192.5	196.2	3.3	<0.01	<0.01	0.11	<0.01	0.08
Carcass wt, kg	84.7	85.0	83.4	84.9	88.4	84.9	2.0	0.42	0.21	0.66	<0.01	0.22
Dressing, %	74.6	75.9	75.9	75.0	75.7	74.4	0.8	0.90	0.70	0.61	<0.01	0.22
BFT4), mm	25.1	22.0	25.8	20.5	25.8	26.4	1.2	0.03	0.01	0.01	<0.01	0.03

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 HP and MP finisher diets during the finisher phases 1 and 2, respectively (see Table  1). The average ADFI during the phases 1 and 2 were 2.64 and 3.14 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 pigs born from both groups of sires with the medium and high (see Table  5) 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.