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Osteochondrosis, but not lameness, is more frequent among free-range pigs than confined herd-mates

Engelsen Etterlin, Pernille and Österberg, Julia and Ytrehus, Bjørnar and Heldmer, Eva and Ekman, Stina and Morrison, David (2015). Osteochondrosis, but not lameness, is more frequent among free-range pigs than confined herd-mates. Acta veterinaria Scandinavica. 57, 1-10
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Official URL: http://dx.doi.org/10.1186/s13028-015-0154-7

Abstract

Background: Organic pig production is expanding and amongst the objectives of organic farming are enhancing animal health and welfare. However, some studies have reported a higher prevalence of lameness and joint condemnation at slaughter in free-range/organic pigs than in conventionally raised pigs. Organic slaughter pigs have free-range housing in which indoor and outdoor access is compulsory, while in conventional farming the pigs are commonly confined to indoor pens. The present study evaluated the effects of free-range and confined housing on lameness prevalence in a herd of 106 finisher pigs, and whether osteochondrosis and Erysipelothrix rhusiopathiae associated arthritis influences these effects. We also evaluated the association between clinical lameness during the rearing period and joint condemnations at slaughter.Results: Seventy free-range and 36 confined housed fattener pigs were scored for their gait twice during the rearing period and 848 joints were evaluated post mortem. Osteochondrosis was more frequent among free-range than confined pigs (P < 0.05), and when present it was also more severe (P < 0.001). Pigs with more numerous and more severe osteochondral lesions had their gait affected more than did pigs with fewer such lesions (P < 0.05). Hence it was a paradox that we did not detect more lameness among the free-range pigs than the confined pigs. E. rhusiopathiae associated arthritis was not diagnosed. The association between gait remarks/clinical lameness and joint condemnations at slaughter was not significant.Conclusions: The results indicate that free-range housing may have both positive and negative effects on locomotory traits. Free-range pigs may be less clinically affected by osteochondrosis than are confined pigs. One explanation for this effect may be strengthening of joint supportive tissue and pain relief promoted by exercise. Visual gait scoring missed serious joint lesions that probably were harmful to the pigs, and should therefore not be used as a sole indicator of joint/leg health in welfare inspection of pigs. The association between gait scores and joint condemnation appeared to be poor. This study was limited to one herd, and so more and larger studies on the effects of free-range housing on lameness severity and osteochondrosis development in pigs are recommended.

Authors/Creators:Engelsen Etterlin, Pernille and Österberg, Julia and Ytrehus, Bjørnar and Heldmer, Eva and Ekman, Stina and Morrison, David
Title:Osteochondrosis, but not lameness, is more frequent among free-range pigs than confined herd-mates
Series/Journal:Acta veterinaria Scandinavica (0044-605X)
Year of publishing :2015
Depositing date:2 December 2015
Volume:57
Page range:1-10
Number of Pages:10
Publisher:BioMed Central
ISSN:0044-605X
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Published version
Full Text Status:Public
Agris subject categories.:L Animal production > L01 Animal husbandry
L Animal production > L10 Animal genetics and breeding
L Animal production > L73 Animal diseases
Subjects:(A) Swedish standard research categories 2011 > 3 Medical and Health Sciences > 302 Clinical Medicine > Orthopeadics
Agrovoc terms:lameness, osteochondritis, free range husbandry, swine
Keywords:Organic, Lameness, Housing, Gait scoring, Joints, Arthritis, Erysipelothrix rhusiopathiae, Osteochondrosis, Welfare
URN:NBN:urn:nbn:se:slu:epsilon-e-3106
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-3106
Additional ID:
Type of IDID
Web of Science (WoS)000362064700002
DOI10.1186/s13028-015-0154-7
ID Code:12781
Faculty:VH - Faculty of Veterinary Medicine and Animal Science
Department:(VH) > Dept. of Biomedical Sciences and Veterinary Public Health
Deposited By: SLUpub Connector
Deposited On:02 Dec 2015 14:52
Metadata Last Modified:22 Feb 2016 08:49

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