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Genetic parameters for somatic cell score in the first three lactations of Czech Holstein and Fleckvieh breeds using a random regression model

Author

Listed:
  • L. Zavadilová

    (Institute of Animal Science, Prague-Uhříněves, Czech Republic)

  • J. Wolf

    (Institute of Animal Science, Prague-Uhříněves, Czech Republic)

  • M. Štípková

    (Institute of Animal Science, Prague-Uhříněves, Czech Republic)

  • E. Němcová

    (Institute of Animal Science, Prague-Uhříněves, Czech Republic)

  • J. Jamrozik

    (Centre for Genetic Improvement of Livestock, Department of Animal and Poultry Science, University of Guelph, Guelph, Canada)

Abstract

A multiple-lactation random regression model was applied to test-day somatic cell score (SCS) records from the first three lactations of Czech Holstein and Fleckvieh cows. For Holstein, the data included 26 314 cows, with 244 953, 76 188 and 26 153 test-day records in the first, second and third lactation, respectively. For Fleckvieh, the data included 24 061 cows, with 223 421, 93 358 and 31 305 test-day records in the first, second and third lactation, respectively. The linear model for SCS included the following factors (for the given parity): fixed herd-test date effect, fixed regressions on days in milk within the age-season class, random regressions for the animal genetic and random regressions for the permanent environmental effect of the cow. Third-degree Legendre polynomials were used for all regressions. Gibbs sampling was used to generate samples from the marginal posterior distributions of the model parameters. The resulting daily heritability ranged from 0.08 to 0.11 in the middle part of lactation and it increased only slightly with parity. Extremely high values (0.25, 0.21) observed especially at the beginning and end of the third lactation for Holstein might be caused by the "end-of-range" problem. The average daily heritabilities computed for the part of lactation between 45 and 255 days in milk (DIM) were in the range from 0.10 to 0.14. Daily permanent environmental variances were higher than the genetic variances and daily residual variances decreased with DIM. The residual variances in early lactation increased with lactation number. For both breeds, the highest genetic correlations computed for the part of lactation between DIM 45 and DIM 255 were obtained between the second and third lactation (0.95). The lowest daily genetic correlations of SCS in the same DIM between different lactations occurred at the beginning of lactation, especially between the first and third lactation. The permanent environmental correlations for selected DIM were lower than the respective genetic correlations.

Suggested Citation

  • L. Zavadilová & J. Wolf & M. Štípková & E. Němcová & J. Jamrozik, 2011. "Genetic parameters for somatic cell score in the first three lactations of Czech Holstein and Fleckvieh breeds using a random regression model," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 56(6), pages 251-260.
  • Handle: RePEc:caa:jnlcjs:v:56:y:2011:i:6:id:1286-cjas
    DOI: 10.17221/1286-CJAS
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    References listed on IDEAS

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    1. K. Yazgan & J. Makulska & A. Węglarz & E. Ptak & M. Gierdziewicz, 2010. "Genetic relationship between milk dry matter and other milk traits in extended lactations of Polish Holstein cows," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 55(3), pages 91-104.
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    Cited by:

    1. J. Ducháček & J. Přibyl & L. Stádník & L. Vostrý & J. Beran & L. Štolc, 2011. "Stability of Aberdeen Angus breeding values in the Czech Republic from 1997 to 2007," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 56(11), pages 509-520.
    2. A. Komprej & Š. Malovrh & G. Gorjanc & D. Kompan & M. Kovač, 2013. "Genetic and environmental parameters estimation for milk traits in Slovenian dairy sheep using random regression model," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 58(3), pages 125-135.

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