The risk of introducing scrapie from restocking goats in Great Britain

A. Ortiz-Pelaez, Louise Anne Kelly, A. Adkin

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The goat population in Great Britain (GB), which is mostly oriented to milk production, is small compared to that in other European Union (EU) countries and contributes a very small fraction of the total livestock production. The recent confirmation and cull of scrapie-affected goat herds has raised the concern that the risk of re-introducing scrapie by mass restocking after the cull of a scrapie-affected herd, may not have been fully considered at the time of implementing statutory eradication measures. A conditional probability model has been developed to estimate the probability of introducing at least one animal infected with classical scrapie into a British goat herd under two scenarios: restocking over one year under normal operating conditions (Scenario 1); and restocking post a whole herd cull as part of the compulsory eradication measures (Scenario 2). Several of the parameters were based on expert opinion, as there is a paucity of data regarding goat industry norms for all sectors. Considering all herds, of which 99% have less than 100 animals, the probability of introduction is approximately 2 times higher for Scenario (2) than for Scenario (1). The risk of subsequently re-introducing the disease through the introduction of replacement stock is not insignificant, although it can be considered very low for the vast majority of herds (>99%). In the case of very large herds (>1000 heads), mass restocking would almost certainly reintroduce the disease since it would require purchases from a very large number of herds.
LanguageEnglish
Pages222-230
Number of pages8
JournalPreventive Veterinary Medicine
Volume107
Issue number3-4
Early online date27 Jun 2012
DOIs
Publication statusPublished - 1 Dec 2012

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Scrapie
scrapie
Goats
goats
herds
Expert Testimony
Livestock
European Union
Industry
Milk
Head
United Kingdom
expert opinion
livestock production
Population
milk production
animals
industry

Keywords

  • scrapie
  • goats
  • restocking
  • risk
  • great britain

Cite this

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abstract = "The goat population in Great Britain (GB), which is mostly oriented to milk production, is small compared to that in other European Union (EU) countries and contributes a very small fraction of the total livestock production. The recent confirmation and cull of scrapie-affected goat herds has raised the concern that the risk of re-introducing scrapie by mass restocking after the cull of a scrapie-affected herd, may not have been fully considered at the time of implementing statutory eradication measures. A conditional probability model has been developed to estimate the probability of introducing at least one animal infected with classical scrapie into a British goat herd under two scenarios: restocking over one year under normal operating conditions (Scenario 1); and restocking post a whole herd cull as part of the compulsory eradication measures (Scenario 2). Several of the parameters were based on expert opinion, as there is a paucity of data regarding goat industry norms for all sectors. Considering all herds, of which 99{\%} have less than 100 animals, the probability of introduction is approximately 2 times higher for Scenario (2) than for Scenario (1). The risk of subsequently re-introducing the disease through the introduction of replacement stock is not insignificant, although it can be considered very low for the vast majority of herds (>99{\%}). In the case of very large herds (>1000 heads), mass restocking would almost certainly reintroduce the disease since it would require purchases from a very large number of herds.",
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The risk of introducing scrapie from restocking goats in Great Britain. / Ortiz-Pelaez, A.; Kelly, Louise Anne; Adkin, A.

In: Preventive Veterinary Medicine, Vol. 107, No. 3-4, 01.12.2012, p. 222-230.

Research output: Contribution to journalArticle

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