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Table 1 Comparison of reproductive performance (LS means and range between farms) between 5 organic and 5 conventional Swedish piglet producing herds (n=4697 farrowings; whereof 830 in the organic herds and 3867 in the conventional herds)

From: Reproductive performance in pigs reared under organic conditions compared with conventionally reared pigs

Trait

Herd type

p-value

 

Organic LS means (Range)

Conventional LS means (Range)

 

Total number of piglets born per litter

13.6 (12.7-13.8)

12.8 (12.2-13.5)

0.0006

Number of piglets born alive per litter

12.4 (10.8-12.9)

12.0 (11.7-12.6)

0.6

Number of piglets stillborn per litter

1.2 (0.9-2.2)

0.8 (0.5-0.9)

<0.0001

Number of piglets weaned per litter

9.8 (9.0-10.8)

10.0 (9.7-10.4)

0.06

Length of nursing period (=age at weaning) in days

50 (40–58)

34 (33–39)

<0.0001

Farrowing interval in days

178 (169–191)

158 (156–165)

<0.0001