title: Factor analysis of linear type traits and their relation with longevity in brazilian holstein cattle.
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.
authors: Embrapa Gado de Leite, Eugênio do Nascimento Street, 610, Juiz de Fora, MG 36038-330, Brazil .
authors: Elisandra Lurdes
authors: EL
authors: Kern
authors: Embrapa Gado de Leite, Eugênio do Nascimento Street, 610, Juiz de Fora, MG 36038-330, Brazil .
authors: Jaime Araújo
authors: JA
authors: Cobuci
authors: Embrapa Gado de Leite, Eugênio do Nascimento Street, 610, Juiz de Fora, MG 36038-330, Brazil .
authors: Cláudio Napolis
authors: CN
authors: Costa
authors: Department of Animal Science, University of Brasília, Campus Darcy Ribeiro, Brasília, DF 70910-900, Brazil . ; Institute Nacional de Ciência e Tecnologia-Informação Genético-Sanitária da Pecuária Brasileira, Belo Horizonte, MG 31270-901, Brazil .
authors: Concepta Margaret McManus
authors: CM
authors: Pimentel
keywords: Autovalues; Final Score; Holstein; Linear Regression; Longevity; Milk Production