Discriminant analysis based on sheep carcass conformation and finishing scores
Autor(a) principal: | |
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Data de Publicação: | 2022 |
Outros Autores: | , , , , |
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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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 |
_version_ |
1797674029618823168 |