Table 4.

Least square means estimates (SEM) and probability values of the effects of feed treatment during late gestation and class of litter size on the birth weight of piglets

	Gilts				P-value
	Class of litter size1
	<15		≥15
	Treatments2
	1.8	2.2	1.8	2.2	Treatment	Litter-size class	Treatment × litter-size class
Item	n = 28	n = 22	n = 32	n = 28
Total piglets born, n	12.1 (0.4)	11.9 (0.4)	16.7 (0.3)	16.6 (0.4)	0.666	<0.001	0.910
Born alive + stillborn, n	11.9 (0.4)	11.7 (0.4)	16.2 (0.4)	16.3 (0.4)	0.930	<0.001	0.729
Piglet birth weight, g	1379.7 (29.2)	1376.8 (33.7)	1151.2 (27.3)	1179.2 (29.2)	0.676	<0.001	0.606
Within-litter birth weight CV, %	16.2 (1.0)	16.1 (1.1)	22.1 (1.0)	20.6 (1.1)	0.470	<0.001	0.534
	Sows				P-value
	Class of litter size1
	<16		≥16
	Treatments2
	1.8	2.2	1.8	2.2	Treatment	Litter-size class	Treatment × litter-size class
Item	n = 74	n = 71	n = 71	n = 81
Total piglets born, n	12.6 (0.2)	13.2 (0.2)	17.7 (0.2)	18.1 (0.2)	0.050	<0.001	0.682
Born alive + stillborn, n	12.5 (0.2)	13.1 (0.2)	17.2 (0.2)	17.7 (0.2)	0.017	<0.001	0.834
Piglet birth weight, g	1454.4 (20.7)	1439.8 (21.0)	1262.1 (21.2)	1281.5 (19.8)	0.907	<0.001	0.413
Within-litter birth weight CV, %	18.3 (0.6)	19.2 (0.6)	22.6 (0.7)	22.5 (0.6)	0.566	<0.001	0.428

¹Class of litter size: considering the median of the total born in gilts and in sows.

²Treatments: 1.8 or 2.2 kg/d from day 90 until farrowing.