Economic assessment of disease losses in farms affected incipiently with porcine reproductive and respiratory syndrome
1998
Ogawa, T. (National Inst. of Animal Health, Kagoshima (Japan). Kyushu Branch) | Hatakeyama, H.
Economic assessments in three farrow-to-operating swine farms affected incipiently with porcine respiratory and reproduction syndrome (PRRS) were carried out in Gunma prefecture on field data of disease monitoring and economic loss survey for a period of one year (1993-1994). The data were collected with number of case and economic loss caused with PRRS infection on each swine category (Suckling, weaning, fattening, sow and boar) in the farms. The incidence density (ID) method was used as a measure of disease frequency for one year, and calculated with an equation of (Number of case)/(Total monthly population). The IDs of PRRS were revealed high levels in boar and suckling groups. The case fatality and culling rate (CFCR) was calculated with an equation of (Number of death and culling)/(Number of case). The CFCRs in each swine category except sow and boar groups were significantly different among the farms. Individual loss (ILoss) which was calculated with (Total loss of case)/(Number of case) was not paralleled to the ID. But, management loss (MLoss) as an average disease cost per one-month-animal in the farms was paralleled to the ID. Incomes in the farms affected with PRRS reduced about 13% to 16% per one fattening and were paralleled with a management scale to the farms. The MLoss has also been influenced with chance or route of PRRS virus inversion and with decision-making on culling by pig owners in the farms
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