Hierarchical and non-hierarchical clustering and artificial neural networks for thechracterization of groups of feedlot-finished male cattle

Authors

  • Wignez Henrique Agência Paulista de Tecnológia dos Agronegócios, Polo Regional do Desenvolvimento Tecnológicos dos Agronegócios Centro Norte, Unidade de Pesquisa e Desenvolvimento (UPD), São José do Rio Preto, SP
  • Antonio Sérgio Ferraudo Universidade Estadual Paulista “Júlio de Mesquita Filho” (UNESP), Faculdade de Ciências Agrárias e Veterinárias (FCAV), Departamento de Ciências Exatas, Jaboticabal, SP
  • Alexandre Amstalden Moraes Sampaio Universidade Estadual Paulista “Júlio de Mesquita Filho” (UNESP), Faculdade de Ciências Agrárias e Veterinárias (FCAV), Departamento de Ciências Exatas, Jaboticabal, SP
  • Dilermando Pérecin Universidade Estadual Paulista “Júlio de Mesquita Filho” (UNESP), Faculdade de Ciências Agrárias e Veterinárias (FCAV), Departamento de Ciências Exatas, Jaboticabal, SP
  • Tiago Máximo da Silva Universidade Estadual Paulista “Júlio de Mesquita Filho” (UNESP), Faculdade de Ciências Agrárias e Veterinárias (FCAV), Departamento de Ciências Exatas, Jaboticabal, SP
  • Luis Orlindo Tedeschi Texas A&M University, Department of Animal Science, College Station, Texas

DOI:

https://doi.org/10.17523/bia.v72n1p41

Keywords:

genetic groups, k-means method, Kohonen, Nellore, performance, sexual condition

Abstract

The individual experimental results of 1,393 feedlot-finished cattle of different genetic groups obtained at different research institutions were collected. Exploratory multivariate hierarchical analysis was applied, which permitted the division of cattle into seven groups containing animals with similar performance patterns. The following variables were studied: weight of the animal at feedlot entry and exit, concentrate percentage, time spent in the feedlot, dry matter intake, weight gain, and feed efficiency. The data were submitted to non-hierarchical k-means cluster analysis, which revealed that all traits should be considered. In addition to the variables used in the previous analysis, the following variables were included: dietary nutrient content, crude protein and total digestible nutrient intake, hot carcass weight and yield, fat coverage, and loin eye area. Using all of these data, structures of 3 to 14 groups were formed which were analyzed using Kohonen self-organizing maps. Specimens of the Nellore breed, either intact or castrated, were diluted among groups in hierarchical and non-hierarchical analysis, as well as in the analysis of artificial neural networks. Nellore animals therefore cannot be characterized as having a single behavior when finished in feedlots, since they participate in groups formed with animals of other Zebu breeds (Gyr, Guzerá) and with animals of European breeds (Hereford, Aberdeen Angus, Caracu) that exhibit different performance potentials.

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Author Biography

  • Alexandre Amstalden Moraes Sampaio, Universidade Estadual Paulista “Júlio de Mesquita Filho” (UNESP), Faculdade de Ciências Agrárias e Veterinárias (FCAV), Departamento de Ciências Exatas, Jaboticabal, SP
    Universidade Paulista “Júlio de Mesquita Filho” (UNESP), Faculdade de Ciências Agrárias e Veterinárias (FCAV), Departamento de Ciências Exatas, Jaboticabal, SP, Brasil.

Published

2015-01-31

Issue

Section

QUANTITATIVE METHODS AND ECONOMY

How to Cite

Hierarchical and non-hierarchical clustering and artificial neural networks for thechracterization of groups of feedlot-finished male cattle. (2015). Bulletin of Animal Husbandry, 72(1), 41-50. https://doi.org/10.17523/bia.v72n1p41

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