Table 1.

Litter performance in sows with high or low litter performance.

Items	H	L	P-value
No. of sows	n = 33	n = 33
Parity	3.76 ± 0.28	3.58 ± 0.24	0.624
Backfat thickness	19.18 ± 0.45	18.76 ± 0.58	0.567
No. of piglets per litter
After cross-foster	10.48 ± 0.16	10.48 ± 0.16	1.000
Day 21 of lactation	10.18 ± 0.15	8.00 ± 0.26	0.001
Litter weight (kg)
After cross-foster	19.36 ± 0.36	18.88 ± 0.36	0.357
Day 21 of lactation	63.40 ± 0.94	38.85 ± 0.91	0.001
Average piglet weight (kg)
After cross-foster	1.86 ± 0.04	1.82 ± 0.05	0.552
Day 21 of lactation	6.25 ± 0.09	4.97 ± 0.14	0.001
Litter weight gain (kg)
Day 1 to 21 of lactation	44.04 ± 1.06	19.97 ± 1.01	0.001

Data are expressed as mean ±SEM. Sows were regarded as the experimental units, n = 33 for each group. H: high litter performance group; L: low litter performance group.