Altogether, 247 animals were sampled in 21 randomly chosen loosely housed sow herds.
Samples were analysed with the haemagglutination inhibition (HI) test.
PPV proved to be common; in 17 farms (81%) at least one animal had a high titre (>1 : 512), and 44% of all animals sampled had a high titre. The vaccination programmes had many shortcomings.
In the generalised estimation equations (GEE) population-averaged model developed, the factors found to have a significant (p 0.05) effect on HI titres were herd size, parity of two or greater and storage of the vaccine vial after use.
Non-returning rate, re-breeding interval and litter size did not differ between herds with no high HI titres (n = 4) and those with at least one high HI titre (n = 17).
Source: Oravainen, J, Heinonen, M, Tast, A, Virolainen, JV & Peltoniemi, OAT (2005): High Porcine Parvovirus Antibodies in Sow Herds: Prevalence and Associated Factors. In: Reproduction in Domestic Animals 40 (1), 57-61.
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