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Culling and mortality among Swedish crossbred sows

Engblom, Linda (2008). Culling and mortality among Swedish crossbred sows. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2008:7
ISBN 978-91-85913-40-4
[Doctoral thesis]

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The aim of this thesis was to investigate culling and mortality among Swedish crossbred sows. Data collection was prospective (2002–2004) from 21 piglet producing herds in south-central Sweden. Average annual removal rate was 49.5%. Of 14 234 removed sows, 85.2% were slaughtered, 10.5% euthanized on farm and 4.3% found dead. Most sows were removed in low parities and soon after weaning. The most common removal reasons were reproductive disorders (26.9%), old age (18.9%) and udder problems (18.1%). In addition, 96 females euthanized or found dead in one herd during 2006 were post mortem examined. Most sows were euthanized due to lameness and had arthritis as primary finding. Removal hazard was estimated using survival analysis. The factor with highest impact on sow removal was days after farrowing, followed by parity and herd×year combination. Removal hazard was highest shortly after weaning and lowest in medium parity numbers. Moreover old age at first farrowing, small litters and long intervals between weaning and next farrowing resulted in high removal hazard. Genetic parameters were estimated on genetic material supplied by the breeding organisation Quality Genetics. Heritability for sow longevity was estimated from 0.03 to 0.12 with survival analysis and linear model analysis. Correlations between estimated breeding values for longevity traits and traits included in the running Swedish breeding evaluation were estimated. Sow longevity was significantly correlated with low age at first farrowing, high litter weight at three weeks, low growth rate (birth to 100 kg) and inferior conformation (measured at station). Genetic improvement of sow longevity would be possible by including stayability from first to second litter in the breeding evaluation.

Authors/Creators:Engblom, Linda
Title:Culling and mortality among Swedish crossbred sows
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :February 2008
Number of Pages:48
ALLI. Engblom, L., Lundeheim, N., Dalin, A.-M. & Andersson, K. 2007. Sow removal in Swedish commercial herds. Livestock Science 106, 76-86. II. Engblom, L., Eliasson-Selling, L., Lundeheim, N., Belák, K., Andersson, K. & Dalin, A.­M. 2008. Post mortem findings in sows and gilts euthanized or found dead in a large Swedish herd. (Submitted) III. Engblom, L., Lundeheim, N., Strandberg, E., Schneider, M. D., Dalin, A.-M. & Andersson, K. 2008. Factors affecting length of productive life in Swedish commercial sows. Journal of Animal Science 86, 432-441. IV. Engblom, L., Lundeheim, N., Schneider, M. D., Dalin, A.-M. & Andersson, K. 2008. Genetics of longevity in Swedish crossbred sows. (Submitted)
Place of Publication:Uppsala
ISBN for printed version:978-91-85913-40-4
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:sows, culling, mortality, crossbreeding, longevity, animal performance
Keywords:crossbred, genetic, length of productive life, lifetime production, longevity, mortality, removal reason, sow, stayability, survival analysis
Permanent URL:
ID Code:1686
Department:(VH) > Dept. of Animal Breeding and Genetics
Deposited By: Linda Engblom
Deposited On:14 Feb 2008 00:00
Metadata Last Modified:02 Dec 2014 10:13

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