Group-level effects of breed and sire on diseases, and influence of diseases on performance of pigs in Danish test stations |
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| Authors: | Bente J rgensen |
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| Institution: | Department for Research in Pigs and Horses, National Institute of Animal Science, Research Centre Foulum, P.O. Box 39, DK-8830, Tjele, Denmark |
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| Abstract: | The epidemiologies of the most common diseases diagnosed in pigs at the Danish pig-breeding test stations were studied with special reference to possible genetic predisposition. The population under study comprised 9084 test pigs (corresponding to 3028 test groups) housed at nine test stations from September 1983 to September 1984. There were substantial differences between the four breeds in the study (Landrace, Yorkshire, Duroc and Hampshire) with the white breeds having higher clinical incidences of respiratory diseases and culling rates than the coloured ones. In only one of nine analyses was a significant sire effect found. However, significant differences were found between breeding centres of origin. There was a negative influence of clinical diseases on daily gain and feed conversion. Classifying respiratory disease in an ‘early’ form (at least one pig in the group was treated during the first 45 days of the test period) and a ‘late’ form (treatments were given after this period) showed that late infections resulted in a higher reduction of performance than early infections did. There were no associations between pathological findings at slaughter and growth rate. |
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