title: Reproductive performance in pigs reared under organic conditions compared with conventionally reared pigs.
abstract: BACKGROUND
  To achieve a competitive reproductive performance in organic pig farming is a major challenge for this farming practise. Practices and research data regarding conventional pig production are not always applicable to organic production, why field studies are needed to identify differences in performance between organic and conventional pig farms in order to identify areas for improvement.
  
  
  RESULTS
  Performance data for one year was collected from 5 organic herds that had more than 30 sows in production and used a computerized recording system, and data from five nearby conventional farms with more than 30 sows and the same recording system were used as a comparison. In total data from 4697 farrowings were analyzed. In the organic pig herds, there were a higher total number of piglets born per litter (p=0.001), a higher number of piglets stillborn per litter (p<0.001), but a tendency (p<0.06) to lower number of weaned pigs per litter and longer nursing period (p<0.001) and farrowing interval (p<0.001).
  
  
  CONCLUSIONS
  The reproductive performance was lower in the organic herds and the variation in reproductive performance among the organic herds was larger than among the conventional ones, suggesting options for improvement in the organic herds.
authors.affiliation: Division of Reproduction, Department of Clinical Sciences, University of Agricultural Sciences, P.O. Box 7054, Uppsala SE-750 07, Sweden.
authors.forename: Ylva
authors.initials: Y
authors.lastname: Lindgren
authors.forename: Nils
authors.initials: N
authors.lastname: Lundeheim
authors.forename: Sofia
authors.initials: S
authors.lastname: Boqvist
authors.forename: Ulf
authors.initials: U
authors.lastname: Magnusson
mesh_terms: D000822:Animal Husbandry / Q000379:methods*; D000818:Animals; D000833:Animals, Suckling; D005260:Female; D007774:Lactation; D008098:Litter Size; D011247:Pregnancy; D011270:Pregnancy, Animal; D050497:Stillbirth / Q000662:veterinary; D013552:Swine; D014886:Weaning