Pre-slaughter risk factors of bruises in cattle carcasses

Detalhes bibliográficos
Autor(a) principal: Teixeira, Pedro Jorge Afonso Teiga
Data de Publicação: 2020
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10348/9708
Resumo: The knowledge of risk factors associated with the transport and handling of live cattle in the pre-slaughter period provides useful information to diminish the number and severity in bruises of carcasses increasing, subsequently, meat quality and economic benefits. The objective of the present study was to determine the risk factors related to lesions in live cattle and carcass bruises. There were obtained handling, transport and housing data from live animals at their arrival to the slaughterhouse in northern Portugal and assessed their associations with both ante and post-mortem periods. Independent variables analyzed included sex, housing in pens (same or mixed-sex), age, breed, main production, body condition, cleanliness, housing duration, duration type, transport duration and feeding supply. The number of bruises and their distribution on seven different zones of the carcass, as well as the severity, shape, color and size, were also assessed. A total of 462 animals were evaluated, and 24% were detected injuries during pre-slaughter (ante-mortem) period, increasing to 51% during carcass (post-mortem) analyses, after the identification of 429 bruises, found in 237 carcasses. Fisher’s Chi-squared (x 2 ) tests showed significant (P< 0.05) effects for most of the variables, except for duration type and housing duration (P> 0.05). Significant variables were then used in multivariate logistic regression analysis and age and sex, but also body condition and cleanliness were the most important risk factors contributing to the occurrence of carcass bruising. The results showed that younger males have prone to more bruises than other animals. Furthermore, housing conditions (mixed-sex pens) and food supply in the pre-slaughter period can also improve the probability of the bruise occurrence. Therefore, the best handling practices should be implemented to increase animal welfare and diminish injuries in live cattle during the pre-slaughter period, in particular, young males, usually more vulnerable to the development of carcass bruises, possibly due to higher aggressive behavior.
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spelling Pre-slaughter risk factors of bruises in cattle carcassesanimal welfarebruisesThe knowledge of risk factors associated with the transport and handling of live cattle in the pre-slaughter period provides useful information to diminish the number and severity in bruises of carcasses increasing, subsequently, meat quality and economic benefits. The objective of the present study was to determine the risk factors related to lesions in live cattle and carcass bruises. There were obtained handling, transport and housing data from live animals at their arrival to the slaughterhouse in northern Portugal and assessed their associations with both ante and post-mortem periods. Independent variables analyzed included sex, housing in pens (same or mixed-sex), age, breed, main production, body condition, cleanliness, housing duration, duration type, transport duration and feeding supply. The number of bruises and their distribution on seven different zones of the carcass, as well as the severity, shape, color and size, were also assessed. A total of 462 animals were evaluated, and 24% were detected injuries during pre-slaughter (ante-mortem) period, increasing to 51% during carcass (post-mortem) analyses, after the identification of 429 bruises, found in 237 carcasses. Fisher’s Chi-squared (x 2 ) tests showed significant (P< 0.05) effects for most of the variables, except for duration type and housing duration (P> 0.05). Significant variables were then used in multivariate logistic regression analysis and age and sex, but also body condition and cleanliness were the most important risk factors contributing to the occurrence of carcass bruising. The results showed that younger males have prone to more bruises than other animals. Furthermore, housing conditions (mixed-sex pens) and food supply in the pre-slaughter period can also improve the probability of the bruise occurrence. Therefore, the best handling practices should be implemented to increase animal welfare and diminish injuries in live cattle during the pre-slaughter period, in particular, young males, usually more vulnerable to the development of carcass bruises, possibly due to higher aggressive behavior.O conhecimento dos fatores de risco associados ao transporte e maneio de gado bovino vivo fornece informações úteis no sentido de diminuir o número e a gravidade dos hematomas nas carcaças e, subsequentemente, aumentar a qualidade da carne e respetivos benefícios económicos. O objetivo do presente estudo consistiu na determinação dos fatores de risco relacionados com lesões em animais vivos, na fase de pré-abate, e com hematomas nas carcaças, na fase pós-abate. Foram obtidos dados de maneio, transporte e permanência na abegoaria de bovinos vivos, na chegada a um matadouro no norte de Portugal e avaliada a associação com os períodos ante e post -mortem. As variáveis independentes analisadas incluíram sexo, tipo de abegoaria (mesmo sexo ou misto), idade, raça, aptidão de produção, condição corporal, grau de limpeza, tempo de permanência na abegoaria e alimentação. Para além do número de hematomas e sua distribuição em sete diferentes zonas da carcaça, foram também avaliadas as variáveis gravidade, cor, idade, forma e tamanho. Do total de 462 animais analisados, foram detetadas lesões em 24% dos bovinos no período pré-abate (ante-mortem), aumentando para 51% na análise das carcaças (post-mortem) após a identificação dos 429 hematomas, identificados em 237 carcaças. Os testes do Qui-Quadrado de Fisher (x 2 ) mostraram efeitos significativos (P 0,05). As variáveis significativas foram usadas, subsequentemente, em análises de regressão logística multivariada e a idade e o sexo e também a condição corporal e a limpeza dos animais foram fatores de risco associados à ocorrência e ao número de hematomas detetados por animal. Os resultados do estudo mostraram ainda que os machos jovens têm uma tendência superior para contrair hematomas do que os restantes animais. Além disso, o tipo de boxe na abegoaria (de sexo misto) e o fornecimento de alimentos no período préabate podem aumentar a probabilidade de ocorrência de hematomas. Por tal motivo, devem ser implementadas práticas adequadas de maneio do gado vivo com o intuito de aumentar o bem-estar dos animais e diminuir as lesões durante o período de préabate, principalmente nos machos jovens, mais vulneráveis ao aparecimento de hematomas na carcaça, possivelmente devido a um comportamento mais agressivo.2020-03-17T16:43:31Z2020-01-23T00:00:00Z2020-01-23info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10348/9708engTeixeira, Pedro Jorge Afonso Teigainfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-11-10T02:07:32Zoai:repositorio.utad.pt:10348/9708Portal AgregadorONGhttps://www.rcaap.pt/oai/openairemluisa.alvim@gmail.comopendoar:71602024-11-10T02:07:32Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Pre-slaughter risk factors of bruises in cattle carcasses
title Pre-slaughter risk factors of bruises in cattle carcasses
spellingShingle Pre-slaughter risk factors of bruises in cattle carcasses
Teixeira, Pedro Jorge Afonso Teiga
animal welfare
bruises
title_short Pre-slaughter risk factors of bruises in cattle carcasses
title_full Pre-slaughter risk factors of bruises in cattle carcasses
title_fullStr Pre-slaughter risk factors of bruises in cattle carcasses
title_full_unstemmed Pre-slaughter risk factors of bruises in cattle carcasses
title_sort Pre-slaughter risk factors of bruises in cattle carcasses
author Teixeira, Pedro Jorge Afonso Teiga
author_facet Teixeira, Pedro Jorge Afonso Teiga
author_role author
dc.contributor.author.fl_str_mv Teixeira, Pedro Jorge Afonso Teiga
dc.subject.por.fl_str_mv animal welfare
bruises
topic animal welfare
bruises
description The knowledge of risk factors associated with the transport and handling of live cattle in the pre-slaughter period provides useful information to diminish the number and severity in bruises of carcasses increasing, subsequently, meat quality and economic benefits. The objective of the present study was to determine the risk factors related to lesions in live cattle and carcass bruises. There were obtained handling, transport and housing data from live animals at their arrival to the slaughterhouse in northern Portugal and assessed their associations with both ante and post-mortem periods. Independent variables analyzed included sex, housing in pens (same or mixed-sex), age, breed, main production, body condition, cleanliness, housing duration, duration type, transport duration and feeding supply. The number of bruises and their distribution on seven different zones of the carcass, as well as the severity, shape, color and size, were also assessed. A total of 462 animals were evaluated, and 24% were detected injuries during pre-slaughter (ante-mortem) period, increasing to 51% during carcass (post-mortem) analyses, after the identification of 429 bruises, found in 237 carcasses. Fisher’s Chi-squared (x 2 ) tests showed significant (P< 0.05) effects for most of the variables, except for duration type and housing duration (P> 0.05). Significant variables were then used in multivariate logistic regression analysis and age and sex, but also body condition and cleanliness were the most important risk factors contributing to the occurrence of carcass bruising. The results showed that younger males have prone to more bruises than other animals. Furthermore, housing conditions (mixed-sex pens) and food supply in the pre-slaughter period can also improve the probability of the bruise occurrence. Therefore, the best handling practices should be implemented to increase animal welfare and diminish injuries in live cattle during the pre-slaughter period, in particular, young males, usually more vulnerable to the development of carcass bruises, possibly due to higher aggressive behavior.
publishDate 2020
dc.date.none.fl_str_mv 2020-03-17T16:43:31Z
2020-01-23T00:00:00Z
2020-01-23
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
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dc.identifier.uri.fl_str_mv http://hdl.handle.net/10348/9708
url http://hdl.handle.net/10348/9708
dc.language.iso.fl_str_mv eng
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dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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