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KMID : 1025520090510050345
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Journal of Animal Science and Technology
2009 Volume.51 No. 5 p.345 ~ p.352
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Estimation of Genetic Parameter for Linear Type Traits in Holstein Dairy Cattle in Korea
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Lee Ki-Hwan
Sang Byung-Chan
Nam Myoung-Soo
Do Chang-Hee
Choi Je-Gwan
Cho Kwang-Hyun
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Abstract
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This study utilized 332,625 records of linear type scores consisting for 15 primary traits, 22,175 final score and 84,612 pedigree information of 22,175 Holstein cows from 1993 to 2007 in Korea to estimate genetic parameters for 16 type traits. Genetic and error (co)variances between two traits selected from 16 traits were estimated using bi-trait pairwise analyses with DFREML package. The estimated heritabilities for stature(ST), strength(STR), body depth(BD), dairy form(DF), rump angle(RA), thurl width(TW), rear legs side view(RLSV), foot angle(FA), fore udder attachment(FUA), rear udder height(RUH), rear udder width(RUW), udder cleft(UC), udder depth(UD), front teat placement(FTP), front teat length(FTL) and final score(FS) were 0.31, 0.21, 0.25, 0.10, 0.29, 0.19, 0.09, 0.06, 0.12, 0.13, 0.12, 0.08, 0.26, 0.20, 0.28 and 0.15, respectively. ST had the highest positive genetic correlation with BD(0.90), while RLSV had the highest negative genetic correlation with FA(－0.56). RA had negative genetic correlation with most udder traits(－0.17~－0.02). Especially, RUW had the higher positive genetic correlation with STR(0.60), BD(0.62), and TW(0.49), however, UD had the higher negative genetic correlation with STR(－0.40) and BD (－0.40). FTL had negative genetic correlation with FUA, RUH, RUW, UC and UD. FS had positive genetic correlation with UC, UD and FTP(0.12, 0.18 and 0.20). However, additional research is needed on the use of these parameters in the genetic evaluation because estimated genetic and error variance-covariance matrices were not positive definite.
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KEYWORD
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Linear type trait, Genetic parameter, Holstein cow
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