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Asian-Australas J Anim Sci > Epub ahead of print
[Epub ahead of print] Published online April 25, 2018.
Importance of the knowledge of pathological processes for risk-based inspection in pig slaughterhouses (Study of 2002 to 2016)
Pedro Sánchez1,2  , Francisco J. Pallarés1  , Miguel A. Gómez1  , Antonio Bernabé1  , Serafín Gómez1  , Juan Seva1,* 
1Departamento de Anatomía y Anatomía Patológica Comparadas, Facultad de Veterinaria, Universidad de Murcia, Espinardo, Murcia 30100, Spain
2Veterinary Inspector, Centre de Salut Pública, Conselleria de Sanitat Universal y Salut Pública, Generalitat Valenciana, Orihuela, Alicante 03300, Spain
Correspondence:  Juan Seva, Tel: +34-868884701, Fax: +34-868884147, Email: jseva@um.es
Received: 19 January 2018   • Revised: 27 March 2018   • Accepted: 18 April 2018
Abstract
Objective: The objective of this work was to determine the prevalence of the pathologies that caused the condemnation of pig carcasses in an area of intensive pig farming and Mediterranean climatology and to evaluate their influence in a risk-based inspection procedure for slaughterhouses.

Methods

A retrospective observational investigation was carried out from 2002 to 2016 into the pathological processes that caused the condemnation of pig carcasses in a slaughterhouse from South-eastern Spain. The seasonal effect on the causes of condemnation carcass was reported. Negative binomial model was used to evaluate the effect of season on the rate of antemortem rejections and post-mortem condemnations. Histopathological examinations were performed to confirm the diagnosis.

Results

The risk of antemortem rejections (0.0564%) was significantly greater in summer (risk ratio [RR] = 1.57). Autumn was associated with higher rate (RR = 1.69) of the total postmortem condemnations (0.1046%). Significantly higher rates of pronounced anaemia (0.0111%) were observed in summer (RR = 3.20). The main causes of anaemia were observed gastroesophageal ulcers and haemorrhagic enteropathies. Significantly highest risk of erysipelas (0.0074%) were observed in autumn (RR = 5.485). About other zoonosis, only eight cases (0.0013%) of carcasses were declared unfit due to tuberculosis lesions. Porcine muscular cysticercosis was not detected. Nevertheless, nonspecific causes such as generalized infections and emaciation represented the half of the condemned carcasses (50.90%).
Conclusion
The pathologies leading to the condemnation of carcasses in this study can be considered representative of the pathologies that affect the pig population from a region with a high intensive production and Mediterranean climatology because this slaughterhouse receives a lot of animals from many farms of different size in a high intensive pig production zone (Mediterranean region). Increased knowledge of environmental factors that may foment the appearance of the diseases is essential for implementing inspection programs based on risk assessment in pig’s slaughterhouses.
Keywords: Pathological Processes; Pigs; Slaughterhouse; Risk-based Inspections; South-Eastern Spain
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