Table 1. Effects of age (AG) and weight (WT) of gilts at first mating on mating weight, gestation weight, weaning weight, and longevity over five consecutive parities

	AG (days)			WT (kg)			SEM	p-value
	< 220	220–240	241 ≤	< 140	140–149	150 ≤		AG	WT	AG × WT
Mating age	217.3	235.0	246.5	219.5	233.1	240.0
Body weight at mating (kg)
Parity 1	145.7	147.8	151.2	134.3c	145.1b	155.0a	2.26	0.071	< 0.01	0.354
Parity 2	164.8	170.9	172.0	161.9c	168.4b	175.7a	3.56	0.087	< 0.01	0.619
Parity 3	182.9	186.2	187.0	180.0	183.7	191.6	5.11	0.660	0.080	0.525
Parity 4	197.4	201.4	200.9	193.5b	198.6b	206.3a	4.12	0.646	0.042	0.199
Parity 5	217.8	220.2	217.2	211.6	219.9	220.8	4.29	0.694	0.127	0.381
Body weight at d 109 of gestation (kg)
Parity 1	182.9b	191.1a	193.6a	180.1a	189.1b	195.6a	2.27	< 0.01	< 0.01	0.549
Parity 2	198.2	203.7	204.8	194.7"	200.9"	209.7a	3.45	0.112	< 0.01	0.737
Parity 3	211.7	215.8	214.1	206.1c	212.6b	220.9a	3.38	0.530	< 0.01	0.398
Parity 4	226.6	231.8	229.1	221.6	228.8	234.9	6.69	0.813	0.055	0.280
Parity 5	247.3	250.0	245.1	240.4	248.3	250.9	7.26	0.441	0.193	0.544
Body weight at weaning (kg)
Parity 1	165.0b	171.2a	171.8a	162.4c	168.4b	175.2a	2.01	0.036	< 0.01	0.480
Parity 2	182.3	185.4	186.7	178.9c	183.6b	190.9a	3.09	0.349	0.033	0.622
Parity 3	197.9	201.3	198.6	191.4c	198.2b	206.1a	3.82	0.678	< 0.01	0.356
Parity 4	217.1	221.5	219.2	212.5	219.1	224.2	7.14	0.792	0.113	0.399
Parity 5	237.3	240.1	233.9	230.6	237.6	240.6	4.88	0.667	0.271	0.645
Longevity	3.92	4.09	4.04	3.97	4.12	3.90	0.20	0.508	0.371	0.856

Means in column are significantly different (p < 0.01).