Factor Analysis of Linear Type Traits and Their Relation with Longevity in Brazilian Holstein Cattle
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초록
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.
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.
참고문헌 (27)
- Caetano, S. L., "Characterization of the variable cow’s age at last calving as a measurement of longevity by using the Kaplan–Meier estimator and the Cox model", Animal, 7, pp.540~546 (2012)
- Campos, R. V., "Genetic Parameters for Linear Type and Yield Traits in Holstein Cows in Brazil", 박사, pp.2012
- Campos, R. V., "Genetic parameters for type traits in Holstein cows in Brazil", R. Bras. Zootec, 41, pp.2150~2161 (2012)
- Caraviello, D. Z., "Analysis of the relationship between type traits, inbreeding, and functional survival in Jersey Cattle using a Weibull Proportional Hazards Model", J. Dairy Sci, 86, pp.2984~2989 (2003)
- Cattell, R. B., "The scree test for the number of factors", Multivariate Behav. Res, 1, pp.245~276 (1966)
- M. X. Chu, "Phenotypic Factor Analysis for Linear Type Traits in Beijing Holstein Cows", ASIAN-AUSTRALASIAN JOURNAL OF ANIMAL SCIENCES, 15(11), pp.1527~1530 (2002), 아세아·태평양축산학회
- Corrales, J. A., "Relationship between type traits and milk production in Holstein cows from Antioquia, Colombia", Rev. MVZ Córdoba, 16, pp.2507~2513 (2011)
- Cruickshank, J., "Indirect prediction of herd life in guernsey dairy cattle", J. Dairy Sci, 85, pp.1307~1313 (2002)
- Cruz, C. D., "Biometric Models Applied to Genetic Improvement", pp.390~ (1997), Federal University of Viçosa
- Esteves, A. M., "Genetic and phenotypic correlations between type traits and milk production in Holstein cattle", Arq. Bras. Med. Vet. Zootec, 56, pp.529~535 (2004)
- Hair, J. R. J. F., "Multivariate data analysis", pp.679~ (2009), Porto Alegre
- Lagrotta, M. R., "Relationship between morphological traits and milk yield in Gir breed cows", Pesq. Agropec. Bras, 45, pp.423~429 (2010)
- Mantovani, R., "Factor analysis for genetic evaluation of linear type traits in dual purpose breeds", Ital. J. Anim. Sci, 4, pp.31~33 (2005)
- Miglior, F., "Selection Indices in Holstein cattle of various countries", J. Dairy Sci, 88, pp.1255~1263 (2005)
- Morek-Kopéc, M., "Relationship between conformation traits and longevity in Polish Holstein Friesian cattle", Livest. Sci, 149, pp.53~61 (2012)
- Pérez-Cabal, M. A., "Genetic and phenotypic relationships among locomotion type traits, profit, production, longevity, and fertility in Spanish dairy cows", J. Dairy Sci, 89, pp.1776~1783 (2006)
- Posadas, M. V., "Genetic parameters for conformation traits, stayability and milk yield for Holstein dairy cattle in Mexico", Téc. Pecu. Méx, 46, pp.235~248 (2008)
- R.K. Pundir, "Factor Analysis of Biometric Traits of Kankrej Cows to Explain Body Conformation", ASIAN-AUSTRALASIAN JOURNAL OF ANIMAL SCIENCES, 24(4), pp.449~456 (2011), 아세아·태평양축산학회
- Rennó, F. P., "Genetic and phenotypic correlations among type traits and milk yield of Brown Swiss cattle in Brazil", R. Bras. Zootec, 32, pp.1419~1430 (2003)
- STAT User’s Guide: ver. 9.22, "SAS", pp.2010, SAS Institute Inc
- Samoré, A. B., "Genetic parameters for functional longevity, type traits, somatic cell scores, milk flow and production in the Italian Brown Swiss", Ital. J. Anim. Sci, 9, pp.145~152 (2010)
- Sewalem, A., "Analysis of the relationship between type traits and functional survival in Canadian Holsteins using a Weibull Proportional Hazards Model", J. Dairy Sci, 87, pp.3938~3946 (2004)
- Schneider, M. P., "Impact of type traits on functional herd life of Quebec Holsteins assessed by survival analysis", J. Dairy Sci, 86, pp.4083~4089 (2003)
- Vanraden, P. M., "Invited review: Selection on net merit to improve lifetime profit", J. Dairy Sci, 87, pp.3125~3131 (2004)
- Visscher, P. M., "Bias in multiple genetic correlation from halfsib design", Genet. Sel. Evol, 27, pp.335~345 (1995)
- Vukasinovic, N., "Factor analysis for evaluating relationships between herd life and type traits in Swiss Brown cattle", Livest. Prod. Sci, 49, pp.227~234 (1997)
- Zavadilová, L., "Genetic correlations between longevity and conformation traits in the Czech Holstein population", Czech J. Anim. Sci, pp.125~136 (2012)