Table 3
Reproductive performances of SPF and CV WZSP sows

Reproductive performances	Candidate sows(n = 8)	SPF colony(n = 14)	Outbred colony(n = 45)
Total litter sizes	7.63 ± 1.30	6.46 ± 1.98	6.35 ± 1.53
Survival numbers at birth	6.88 ± 1.55*	5.46 ± 1.94	6.23 ± 1.53
Survival numbers at weaning	6.13 ± 1.13	5.31 ± 1.75	5.45 ± 1.95
Estrus cycle	-	21.22 ± 0.88	21.16 ± 0.75
Estrus duration	-	3.98 ± 0.42	4.18 ± 0.31
Gestation period	-	113.55 ± 2.50	113.0 ± 2.33