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Relationship of Somatic Cell Score and Udder Type Traits of Holstein Cattle

체세포점수와 홀스타인 유방형질간의 관계

  • 최태정 (농촌진흥청 축산과학원) ;
  • 서강석 (농촌진흥청 축산과학원) ;
  • 김시동 (농촌진흥청 축산과학원) ;
  • 박병호 (농촌진흥청 축산과학원) ;
  • 최재관 (농촌진흥청 축산과학원) ;
  • 윤호백 (농촌진흥청 축산과학원) ;
  • 나승환 (농촌진흥청 축산과학원) ;
  • 손삼규 (농촌진흥청 축산과학원) ;
  • 권오섭 (농촌진흥청 축산과학원) ;
  • 조광현 (농촌진흥청 축산과학원)
  • Published : 2008.06.01

Abstract

Data were taken from the dairy herd improve- ment program from the year 2000, composed of 10,929 first lactation cows consisting of 290,144 test-day records and 37,723 udder type records. The objective of the study was to estimate genetic and phenotypic correlation between fore udder attachment, rear udder height, rear udder width, udder cleft, udder depth, and somatic cell score (SCS) and to calculate heritability of udder depth, front teat length and SCS in Holstein cattle in Korea. The variance component estima- tion using test day model was determined by a derivative-free algorithm-restricted maximum likeli- hood(DF-REML) analysis method. Generally phenotypic correlations were very low between udder traits and lactation SCS which varied from -0.03 to -0.06. Heritability of all type traits and SCS was smaller than 0.12. The results of this study would be applicable to SCS using linear genetic evaluation for future studies.

Keywords

Somatic cell score; DF-REML; Udder type traits

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