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Factor Analysis of Linear Type Traits and Their Relation with Longevity in Brazilian Holstein Cattle

  • Kern, Elisandra Lurdes (Department of Animal Science, Federal University of Rio Grande do Sul) ;
  • Cobuci, Jaime Araujo (Department of Animal Science, Federal University of Rio Grande do Sul) ;
  • Costa, Claudio Napolis (Embrapa Gado de Leite) ;
  • Pimentel, Concepta Margaret McManus (Department of Animal Science, University of Brasilia, Campus Darcy Ribeiro)
  • Received : 2013.12.14
  • Accepted : 2014.02.24
  • Published : 2014.06.01

Abstract

In this study we aimed to evaluate the reduction in dimensionality of 20 linear type traits and more final score in 14,943 Holstein cows in Brazil using factor analysis, and indicate their relationship with longevity and 305 d first lactation milk production. Low partial correlations (-0.19 to 0.38), the medium to high Kaiser sampling mean (0.79) and the significance of the Bartlett sphericity test (p<0.001), indicated correlations between type traits and the suitability of these data for a factor analysis, after the elimination of seven traits. Two factors had autovalues greater than one. The first included width and height of posterior udder, udder texture, udder cleft, loin strength, bone quality and final score. The second included stature, top line, chest width, body depth, fore udder attachment, angularity and final score. The linear regression of the factors on several measures of longevity and 305 d milk production showed that selection considering only the first factor should lead to improvements in longevity and 305 milk production.

Keywords

Autovalues;Final Score;Milk Production;Linear Regression;Longevity;Holstein

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