Discriminant analysis based on sheep carcass conformation and finishing scores

Detalhes bibliográficos
Autor(a) principal: Maciel, Marilene dos Santos
Data de Publicação: 2022
Outros Autores: Aranhas, Janaína Kelli Gomes, Carvalho, Francisco Fernando Ramos de, Cruz, George Rodrigo Beltrão da, Ribeiro, Neila Lidiany, Ribeiro, Maria Norma
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Revista Caatinga
Texto Completo: https://periodicos.ufersa.edu.br/caatinga/article/view/10923
Resumo: Carcass classification consists of grouping animals with similar carcass characteristics. When the groups are defined a priori, as in the case of conformation and finishing scores, the interest is to identify the contribution of each variable used in separating the groups. Therefore, discriminant analysis was used to discriminate Santa Inês animals according to the conformation and carcass finishing scores (score 2 = regular, score 3 = good) and to identify the variables that most contribute to the differentiation. The conformation and carcass finishing scores vary from 1 to 5. This study used scores 2 and 3, considering that the evaluated animals ranged between these two respective scales. The database consisted of information from 122 uncastrated Santa Inês sheep submitted to the confinement regime, of which 24 variables related to the carcass of the animals were recorded. Data were submitted to the Mardia test to verify multivariate normality, followed by the nonparametric k-nearest neighbor (k-NN) test. The stepwise procedure selected a particular subset of variables, and the Mahalanobis Distance (D²) was used to assess the separation of groups (p-value ˂ 0.05). The variables with the highest discriminatory power for the carcass conformation scores were cold carcass weight (CCW), external carcass length (ECL), and neck (NEC), for carcass finishing were live weight at slaughter (LWS), ECL, and thoracic perimeter (TP). The multivariate discriminant analysis proved efficient in allocating the animals in their groups of origin.
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spelling Discriminant analysis based on sheep carcass conformation and finishing scoresAnálise discriminante baseada nos escores de conformação e acabamento de carcaça de ovinosMétodos multivariados. Ovinos Santa Inês. Classificação de carcaça.Multivariate methods. Santa Inês sheep. Carcass classification.Carcass classification consists of grouping animals with similar carcass characteristics. When the groups are defined a priori, as in the case of conformation and finishing scores, the interest is to identify the contribution of each variable used in separating the groups. Therefore, discriminant analysis was used to discriminate Santa Inês animals according to the conformation and carcass finishing scores (score 2 = regular, score 3 = good) and to identify the variables that most contribute to the differentiation. The conformation and carcass finishing scores vary from 1 to 5. This study used scores 2 and 3, considering that the evaluated animals ranged between these two respective scales. The database consisted of information from 122 uncastrated Santa Inês sheep submitted to the confinement regime, of which 24 variables related to the carcass of the animals were recorded. Data were submitted to the Mardia test to verify multivariate normality, followed by the nonparametric k-nearest neighbor (k-NN) test. The stepwise procedure selected a particular subset of variables, and the Mahalanobis Distance (D²) was used to assess the separation of groups (p-value ˂ 0.05). The variables with the highest discriminatory power for the carcass conformation scores were cold carcass weight (CCW), external carcass length (ECL), and neck (NEC), for carcass finishing were live weight at slaughter (LWS), ECL, and thoracic perimeter (TP). The multivariate discriminant analysis proved efficient in allocating the animals in their groups of origin.A classificação da carcaça consiste em agrupar animais com características de carcaça semelhantes. Quando os grupos são definidos a priori, como o caso dos escores de conformação e acabamento, o interesse é identificar a contribuição de cada variável utilizada na separação dos grupos. Diante disso, utilizou-se a análise discriminante para discriminar animais da raça Santa Inês em função dos escores de conformação e acabamento (escore 2 = razoável, escore 3 = boa) e, identificar as variáveis que mais contribuem na diferenciação. Os escores de conformação e acabamento variam numa escala de 1 a 5. Nesse estudo, foram usados escores 2 e 3 considerando que os animais avaliados variaram entre essas duas respectivas escalas. O banco de dados foi composto por 122 informações de ovinos não castrados da raça Santa Inês, submetidos ao regime de confinamento, dos quais foram registradas 24 variáveis relacionadas à carcaça dos animais. Os dados foram submetidos ao teste de Mardia, para verificar a normalidade multivariada, seguido do teste não-paramétrico k-vizinho mais próximo (K-NN). Um subconjunto particular de variáveis foi selecionado pelo procedimento stepwise e a Distância de Mahalanobis (D²) para avaliar a separação dos grupos (p-valor ˂ 0,05). As variáveis com maior poder discriminatório para os escores de conformação de carcaça foram peso de carcaça fria (PCF), comprimento externo da carcaça (CEC) e pescoço (PES), para acabamento de carcaça foram peso vivo ao abate (PVA), CEC e perímetro torácico (PT). A análise discriminante multivariada mostrou-se eficiente para alocar os animais em seus grupos de origem.Universidade Federal Rural do Semi-Árido2022-12-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://periodicos.ufersa.edu.br/caatinga/article/view/1092310.1590/1983-21252023v36n121rcREVISTA CAATINGA; Vol. 36 No. 1 (2023); 199-206Revista Caatinga; v. 36 n. 1 (2023); 199-2061983-21250100-316Xreponame:Revista Caatingainstname:Universidade Federal Rural do Semi-Árido (UFERSA)instacron:UFERSAenghttps://periodicos.ufersa.edu.br/caatinga/article/view/10923/11085Copyright (c) 2022 Revista Caatingainfo:eu-repo/semantics/openAccessMaciel, Marilene dos SantosAranhas, Janaína Kelli GomesCarvalho, Francisco Fernando Ramos de Cruz, George Rodrigo Beltrão da Ribeiro, Neila Lidiany Ribeiro, Maria Norma 2023-07-27T12:33:04Zoai:ojs.periodicos.ufersa.edu.br:article/10923Revistahttps://periodicos.ufersa.edu.br/index.php/caatinga/indexPUBhttps://periodicos.ufersa.edu.br/index.php/caatinga/oaipatricio@ufersa.edu.br|| caatinga@ufersa.edu.br1983-21250100-316Xopendoar:2024-04-29T09:46:59.583188Revista Caatinga - Universidade Federal Rural do Semi-Árido (UFERSA)true
dc.title.none.fl_str_mv Discriminant analysis based on sheep carcass conformation and finishing scores
Análise discriminante baseada nos escores de conformação e acabamento de carcaça de ovinos
title Discriminant analysis based on sheep carcass conformation and finishing scores
spellingShingle Discriminant analysis based on sheep carcass conformation and finishing scores
Maciel, Marilene dos Santos
Métodos multivariados. Ovinos Santa Inês. Classificação de carcaça.
Multivariate methods. Santa Inês sheep. Carcass classification.
title_short Discriminant analysis based on sheep carcass conformation and finishing scores
title_full Discriminant analysis based on sheep carcass conformation and finishing scores
title_fullStr Discriminant analysis based on sheep carcass conformation and finishing scores
title_full_unstemmed Discriminant analysis based on sheep carcass conformation and finishing scores
title_sort Discriminant analysis based on sheep carcass conformation and finishing scores
author Maciel, Marilene dos Santos
author_facet Maciel, Marilene dos Santos
Aranhas, Janaína Kelli Gomes
Carvalho, Francisco Fernando Ramos de
Cruz, George Rodrigo Beltrão da
Ribeiro, Neila Lidiany
Ribeiro, Maria Norma
author_role author
author2 Aranhas, Janaína Kelli Gomes
Carvalho, Francisco Fernando Ramos de
Cruz, George Rodrigo Beltrão da
Ribeiro, Neila Lidiany
Ribeiro, Maria Norma
author2_role author
author
author
author
author
dc.contributor.author.fl_str_mv Maciel, Marilene dos Santos
Aranhas, Janaína Kelli Gomes
Carvalho, Francisco Fernando Ramos de
Cruz, George Rodrigo Beltrão da
Ribeiro, Neila Lidiany
Ribeiro, Maria Norma
dc.subject.por.fl_str_mv Métodos multivariados. Ovinos Santa Inês. Classificação de carcaça.
Multivariate methods. Santa Inês sheep. Carcass classification.
topic Métodos multivariados. Ovinos Santa Inês. Classificação de carcaça.
Multivariate methods. Santa Inês sheep. Carcass classification.
description Carcass classification consists of grouping animals with similar carcass characteristics. When the groups are defined a priori, as in the case of conformation and finishing scores, the interest is to identify the contribution of each variable used in separating the groups. Therefore, discriminant analysis was used to discriminate Santa Inês animals according to the conformation and carcass finishing scores (score 2 = regular, score 3 = good) and to identify the variables that most contribute to the differentiation. The conformation and carcass finishing scores vary from 1 to 5. This study used scores 2 and 3, considering that the evaluated animals ranged between these two respective scales. The database consisted of information from 122 uncastrated Santa Inês sheep submitted to the confinement regime, of which 24 variables related to the carcass of the animals were recorded. Data were submitted to the Mardia test to verify multivariate normality, followed by the nonparametric k-nearest neighbor (k-NN) test. The stepwise procedure selected a particular subset of variables, and the Mahalanobis Distance (D²) was used to assess the separation of groups (p-value ˂ 0.05). The variables with the highest discriminatory power for the carcass conformation scores were cold carcass weight (CCW), external carcass length (ECL), and neck (NEC), for carcass finishing were live weight at slaughter (LWS), ECL, and thoracic perimeter (TP). The multivariate discriminant analysis proved efficient in allocating the animals in their groups of origin.
publishDate 2022
dc.date.none.fl_str_mv 2022-12-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://periodicos.ufersa.edu.br/caatinga/article/view/10923
10.1590/1983-21252023v36n121rc
url https://periodicos.ufersa.edu.br/caatinga/article/view/10923
identifier_str_mv 10.1590/1983-21252023v36n121rc
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv https://periodicos.ufersa.edu.br/caatinga/article/view/10923/11085
dc.rights.driver.fl_str_mv Copyright (c) 2022 Revista Caatinga
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Copyright (c) 2022 Revista Caatinga
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidade Federal Rural do Semi-Árido
publisher.none.fl_str_mv Universidade Federal Rural do Semi-Árido
dc.source.none.fl_str_mv REVISTA CAATINGA; Vol. 36 No. 1 (2023); 199-206
Revista Caatinga; v. 36 n. 1 (2023); 199-206
1983-2125
0100-316X
reponame:Revista Caatinga
instname:Universidade Federal Rural do Semi-Árido (UFERSA)
instacron:UFERSA
instname_str Universidade Federal Rural do Semi-Árido (UFERSA)
instacron_str UFERSA
institution UFERSA
reponame_str Revista Caatinga
collection Revista Caatinga
repository.name.fl_str_mv Revista Caatinga - Universidade Federal Rural do Semi-Árido (UFERSA)
repository.mail.fl_str_mv patricio@ufersa.edu.br|| caatinga@ufersa.edu.br
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