Factor analysis of linear type traits and their relation with longevity in brazilian holstein cattle

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)...

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Published inAsian-australasian journal of animal sciences Vol. 27; no. 6; pp. 784 - 790
Main Authors Kern, Elisandra Lurdes, Cobuci, Jaime Araújo, Costa, Cláudio Napolis, Pimentel, Concepta Margaret McManus
Format Journal Article
LanguageEnglish
Published Korea (South) Asian - Australasian Association of Animal Production Societies 01.06.2014
Asian-Australasian Association of Animal Production Societies (AAAP) and Korean Society of Animal Science and Technology (KSAST)
Asian-Australasian Association of Animal Production Societies
Subjects
Autovalues
Cattle
Final Score
Genetic aspects
Genetic research
Holstein
Lactation
Linear Regression
Longevity
Milk Production
Quantitative trait loci
Zoological research
Brazil
Holstein
Longevity
Milk Production
Final Score
Linear Regression
Autovalues
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Summary: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.
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Department of Animal Science, Federal University of Rio Grande do Sul, Porto Alegre, RS 91540-000, Brazil
ISSN:1011-2367
1976-5517
DOI:10.5713/ajas.2013.13817