Principal component analysis of conformation traits in Hungarian Simmental cows
Evelin Török, István Komlósi, Béla Béri, Imre Füller, Barnabás Vágó, János Posta
https://doi.org/10.17221/155/2020-CJASCitation:Török E., Komlósi I., Béri B., Füller I., Vágó B., Posta J. (2021): Principal component analysis of conformation traits in Hungarian Simmental cows. Czech J. Anim. Sci., 66: 39–45.
The aim of the current research was to analyze the linear type traits of Hungarian Simmental dual-purpose cows scored in the first lactation using principal component analysis and cluster analysis. Data collected by the Association of Hungarian Simmental Breeders were studied during the work. The filtered database contained the results of 8 868 cows, born after 1997. From the evaluation of main conformation traits, the highest correlations (r = 0.35, P < 0.05) were found between mammary system and feet and legs traits. Within linear type traits, the highest correlation was observed between rump length and rump width (r = 0.81, P < 0.05). Using the principal component analysis, main conformation traits were combined into groups. There were three factors having 84.5 as total variance ratio after varimax rotation. Cluster analysis verified the results of the principal component analysis as most of the trait groups were similar. The strongest relationship was observed between feet and legs and mammary system (main conformation traits) and between rump length and rump width (linear type traits).
linear type traits; cluster analysis; correlation
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Chu MX, Shi SK. Phenotypic factor analysis for linear type traits in Beijing Holstein cows. Asian-Australas J Anim Sci. 2002 Jan 1;15(11):1527-30. https://doi.org/10.5713/ajas.2002.1527
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Everitt BS, Landau S, Leese M. Cluster analysis. London: Taylor and Francis; 2001. p. 237.
Frigo E, Samore AB, Vicario D, Bagnato A, Pedron O. Heritabilities and genetic correlations of body condition score and muscularity with productive traits and their trend functions in Italian Simmental cattle. Ital J Anim Sci. 2013;12(40):240-6. https://doi.org/10.4081/ijas.2013.e40
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Kern EL, Cobuci JA, Costa CN, Pimentel CMM. Factor analysis of linear type traits and their relation with longevity in Brazilian Holstein cattle. Asian-Australas J Anim Sci. 2014 Jun;27(6):784-90. https://doi.org/10.5713/ajas.2013.13817
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Nemcova E, Stipkova M, Zavadilova L. Genetic parameters for linear type traits in Czech Holstein cattle. Czech J Anim Sci. 2011 Apr;56(4):157-62.
Pryce JE, Coffey MP, Brotherstone S. The genetic relationship between calving interval, body condition score and linear type and management traits in registered Holsteins. J Dairy Sci. 2000 Nov;83(11):2664-71.
Roveglia C, Niero G, Bobbo T, Penasa M, Finocchiaro R, Visentin G, Lopez-Villalobos N, Cassandro M. Genetic parameters for linear type traits including locomotion in Italian Jersey cattle breed. Livest Sci. 2019 Nov 1;229:131-6. https://doi.org/10.1016/j.livsci.2019.09.023
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Zavadilova L, Nemcova E, Stipkova M, Bouska J. Relationships between longevity and conformation traits in Czech Fleckvieh cows. Czech J Anim Sci. 2009 Sep 1;54(9):387-94. https://doi.org/10.17221/1685-CJAS
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