Variance Component Estimates with Dominance Models for Milk Production in Holsteins of Japan Using Method R

  • Kawahara, Takayoshi (Holstein Cattle Association of Japan, Hokkaido Branch) ;
  • Gotoh, Yusaku (Holstein Cattle Association of Japan, Hokkaido Branch) ;
  • Yamaguchi, Satoshi (Hokkaido Dairy Cattle Milk Recording and Testing Association) ;
  • Suzuki, Mitsuyoshi (Obihiro University of Agriculture and Veterinary Medicine)
  • Received : 2005.09.12
  • Accepted : 2006.01.05
  • Published : 2006.06.01


Fractions of herd-year-season, sire by herd interaction, additive genetic and dominance genetic variances were estimated for milk production traits in Holsteins of Japan using Method R. Inbreeding depressions for milk production traits were also estimated. Estimated fractions of herd-year-season variances ranged from 0.056 to 0.074 for yield traits and from 0.033 to 0.035 for content traits. Estimated fractions of additive genetic variances to phenotypic variances (heritabilities across a herd in the narrow sense) were 0.306, 0.287, 0.273, 0.255, 0.723, 0.697 and 0.663 for milk, fat, SNF and protein yields, and fat, SNF and protein contents, respectively. Estimated fractions of dominance genetic variances ranged from 0.019 to 0.022 for yield traits and from 0.014 to 0.018 for content traits. Fractions of variances for sire by herd interaction were estimated to range from 0.020 to 0.025 for yield traits and 0.011 to 0.012 for content traits. Estimates of inbreeding depression for milk, fat, SNF and protein yields were -36.16 kg, -1.42 kg, -3.24 kg and -1.15 kg per 1% inbreeding for milk, fat, SNF and protein yields, respectively. Estimates of depression per 1% inbreeding for content traits were positive at $0.39{\times}10^{-3}%$, $0.31{\times}10^{-3}%$ and $0.82{\times}10^{-3}%$ for fat, SNF and protein contents, respectively.


Method R;Additive Variance;Dominance Variance;Sire by Herd Interaction;Inbreeding Depression;Milk Production;Holstein


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