Table 2. Effects of age (AG) and weight (WT) of gilts at first mating on backfat thickness (BFT) over five consecutive parities

	AG (days)			WT (kg)			SEM	p-value
	< 220	220-240	241 ≤	< 140	140-149	150 ≤		AG	WT	AG × WT
BFT at insemination (mm)
Parity 1	15.1	15.6	16.1	14.8	15.1	16.1	0.39	0.079	0.011	0.194
Parity 2	15.5	15.8	16.4	15.2	15.2	16.4	0.41	0.086	0.043	0.756
Parity 3	15.8	16.1	16.4	15.6	15.8	16.4	0.51	0.192	0.162	0.654
Parity 4	16.4	17.1	17.2	16.3	17.0	17.1	0.43	0.158	0.149	0.865
Parity 5	17.8	18.4	17.5	17.4	18.2	17.8	0.69	0.310	0.382	0.282
BFT at day 109 of gestation (mm)
Parity 1	17.6	19.0	19.1	17.5b	17.9ab	19.4a	0.58	0.088	0.027	0.541
Parity 2	17.4	18.4	18.8	17.4	18.0	19.0	1.26	0.438	0.400	0.670
Parity 3	18.0	19.0	18.9	18.1	18.7	19.0	0.68	0.433	0.555	0.673
Parity 4	19.1	20.0	19.6	18.8	19.8	19.8	1.06	0.723	0.625	0.560
Parity 5	20.0	20.7	21.2	19.7	20.4	22.8	1.89	0.922	0.364	0.759
BFT at weaning (mm)
Parity 1	15.9	16.4	16.4	15.5	15.7	16.6	0.38	0.230	0.023	0.676
Parity 2	16.0	16.0	16.5	15.6	15.5	16.5	0.38	0.254	0.071	0.946
Parity 3	16.3	16.8	17.0	16.3	16.8	16.7	0.67	0.644	0.785	0.924
Parity 4	17.6	18.3	18.0	17.4	18.1	18.2	0.76	0.889	0.508	0.728
Parity 5	18.4	19.0	18.4	17.7	18.8	18.9	0.93	0.652	0.287	0.661

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