The impact of porcine reproductive and respiratory syndrome on the productivity in Danish finisher herds
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Andersen, Lars Reuss Haahr1, Forfatter
Stege, Helle1, Vejleder
Kristensen, Charlotte Sonne1, Vejleder
1Det Biovidenskabelige Fakultet, København, Danmark, diskurs:18              
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Ukontrollerede emneord: slagtesvin, PRRSv, productionsøkonomi,
 Abstract: Abstract (both literature 1 study and article) 2 Porcine reproductive and respiratory syndrome virus (PRRSv) affects swine production all over the3 world. This study focuses on finisher herds. The clinical manifestations of PRRSv primarily are 4 lethargy, anorexia, pyrexia, tachypnoea and dyspnoea. Both clinical and sub-clinical PRRSv 5 infected finishers show decreased average daily gain (ADG) and clinical affected finisher herds6 show increased mean mortality and feed conversion rate. PRRSv infections causes localized 7 immune suppression in the lungs and show positively interaction with other pathogens. Vaccines 8 against PRRSv are marketed even though the efficiency is questionable and none have showed9 cross protection of heterous PRRSv strains. The Danish PRRSv infected finisher herds are assumed 10 to be subclinically affected and have a PRRSv seroconversion of 69 % which makes the economic11 impact 25 Danish crones/finisher. The PRRSv coinfections most relevant to assess in the Danish 12 finisher herd were Mycoplasma Hyopneunoniae (MH) and Actinobacillus Pleuropneumoniae (AP).13 MH because it is the most prevalent respiratory pathogen in Danish finisher herds and have been 14 found to potentiate PRRSv infection. AP because it can interact with PRRSv and has devastating 15 potential impact on finisher herds.16 Therefore a study was made to examine whether the mean ADG, mortality and feed conversion rate 17 of PRRSv positive (clinical or subclinically infected) finisher herds was different from PRRSV 18 negative finisher herds including possible interaction with AP and MH. A secondary aim of the 19 study was to estimate the cost of the established effects of PRRSv. The results showed no difference 20 in the mean ADG, mortality and feed conversion rate of PRRSv positive finisher herds. Comparing 21 groups with different herd health declaration of PRRSv, AP and MH showed interacting effects22 between herds positive for PRRSv and AP resulting in an increase in ADG, interaction between 23 herds positive of AP and MH resulting in a decrease in ADG and a interaction between PRRSv and 24 MH resulting in decreased mortality.
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 Type: Speciale
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Sprog: English - eng
 Datoer: 2012
 Sider: 72 pages
 Publiceringsinfo: København, Danmark : Institut for Produktionsdyr og Heste
 Indholdsfortegnelse: -
 Note: Veterinary Medicine, Veterinærmedicin
 Type: Speciale
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