Table 6.

Effect of enzyme supplementation for sows on litter and piglet performance

	Parity group			Enzyme		Statistical analysis1
Enzyme	1	2	3	−	+	SEM2	Parity	Enzyme	Interaction	R 2
Number of observation	146	353	485	492	492
Litter size
Birth	11.3ab	11.8a	10.0b	11.7	11.7	1.5	0.001	0.802	0.801	0.27
Weaning	10.4a	10.3a	10.0b	10.3	10.3	1.5	0.001	0.947	0.219	0.27
Piglet BW, kg
Birth	1.5	1.6	1.5	1.5	1.5	0.2	0.068	0.727	0.929	0.16
Weaning	6.5b	7.0a	6.9a	6.7	6.9	0.9	<0.0001	0.009	0.025	0.49
Weight gain	5.0b	5.3a	5.4a	5.2	5.4	0.8	<0.0001	0.120	0.008	0.53
Litter weight, kg
Birth	17.0b	18.7a	18.1a	17.8	17.9	3.3	<0.0001	0.657	0.583	0.25
Weaning	65.7c	75.8a	69.1b	67.8	70.6	13.0	<0.0001	0.001	0.122	0.44
Weight gain	48.4b	57.1a	50.3ab	48.4	52.2	10.7	<0.0001	0.001	0.009	0.40

¹From the analysis of variance of 992 results including group parity (n = 3; group 1 includes primiparus, group 2 includes parity 2 and parity 3 and group 3 includes parity 4 and older), assay (n = 8), and enzyme (n = 2). Means with different subscript letter were significantly different P < 0.05.

²SEM for the overall model.