Descriptive and temporal analysis of post-mortem lesions recorded in slaughtered pigs in New Zealand from 2000 to 2010

New Zealand Veterinary Journal
Ej NeumannJ Ling Min Than

Abstract

To complete a retrospective analysis of data from a national abattoir-based lesion recording system (PigCheck) in the New Zealand pig industry, in order to establish the prevalence of 20 post-mortem disease lesions, describe long-term trends in the prevalence of these lesions, and identify the proportion of the monthly variation in lesion prevalence that could be attributed to individual farms or abattoirs. Slaughter lesion data were collected and reported at the lot level (a cohort of pigs delivered from one farm, at one time). Data on the prevalence of lesions between January 2000 and December 2010 was aggregated by month, and time-series analysis of the data for each lesion was conducted. The time series pattern for each lesion was described with an auto-regressive integrated moving average (ARIMA) model; seasonality of lesion occurrence was assessed separately. To determine the proportion of variance in lesion prevalence that could be attributed to farms relative to that attributed to abattoirs, a hierarchical binomial generalised linear mixed model was created incorporating two random effect levels, at the farm (within abattoir) and abattoir levels. A dataset comprised of 124,407 lots (6,220,664 pigs, 279 farms, five abatt...Continue Reading

References

Dec 1, 1984·Australian Veterinary Journal·A M Pointon, M Sloane
Mar 6, 2002·Acta Veterinaria Scandinavica. Supplementum·S O OlssonO Østerås
Dec 1, 1990·New Zealand Veterinary Journal·N H Christensen, L C Cullinane
Jul 21, 2005·New Zealand Veterinary Journal·K D StärkR S Morris

❮ Previous
Next ❯

Software Mentioned

R Foundation for
PigMON
R
Excel
R Development Core Team
PigCheck

Related Concepts

Related Feeds

Ascariasis (ASM)

Ascariasis is a helminthic infection of global distribution with more than 1.4 billion persons infected throughout the world. Here is the latest research.

Ascariasis

Ascariasis is a helminthic infection of global distribution with more than 1.4 billion persons infected throughout the world. Here is the latest research.