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Genetic parameters of test-day somatic cell scores for the first three lactations of Polish Holstein-Friesian cattle

Author

Listed:
  • K. Rzewuska

    (Department of Genetics and Animal Breeding, Faculty of Animal Breeding and Biology, Poznan University of Life Sciences, Poznan, Poland)

  • J. Jamrozik

    (Department of Animal and Poultry Science, Ontario Agricultural College, University of Guelph, Ontario, Canada)

  • A. Żarnecki

    (National Research Institute of Animal Production, Balice, Poland)

  • T. Strabel

    (Department of Genetics and Animal Breeding, Faculty of Animal Breeding and Biology, Poznan University of Life Sciences, Poznan, Poland)

Abstract

Genetic parameters for somatic cell score in the first three lactations of Polish Holstein-Friesian cattle were estimated. A multiple-lactation model was applied with random herd-test-day effect, fixed regressions for herd-year and age-season of calving, and random regressions for the additive genetic and permanent environmental effects. The large data set was used that included over one million test-day records and more than 58 000 cows. Estimates of covariance components and genetic parameters were obtained by Bayesian methods using the Gibbs sampler. Average daily heritabilities of somatic cell score (SCS) in the first three lactations were 0.11, 0.12 and 0.14 for the first, second and third lactation, respectively. Estimates of daily heritabilities were rather independent of days in milk (DIM), with no serious abnormalities at the beginning or the end of lactation. Average genetic correlations between SCS on the same DIM were 0.68, 0.62 and 0.70 for first and second, first and third, and second and third parities, respectively, and did not exceed 0.77. The low level of heritability estimates and relatively low genetic correlations between lactations would suggest that selection based on the first lactation only could limit a response in mastitis resistance for later lactations.

Suggested Citation

  • K. Rzewuska & J. Jamrozik & A. Żarnecki & T. Strabel, 2011. "Genetic parameters of test-day somatic cell scores for the first three lactations of Polish Holstein-Friesian cattle," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 56(9), pages 381-389.
    • Handle: RePEc:caa:jnlcjs:v:56:y:2011:i:9:id:1288-cjas
    DOI: 10.17221/1288-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. A. Jóźwik & N. Strzałkowska & E. Bagnicka & W. Grzybek & J. Krzyżewski & E. Poławska & A. Kołataj & J.O. Horbańczuk, 2012. "Relationship between milk yield, stage of lactation, and some blood serum metabolic parameters of dairy cows," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 57(8), pages 353-360.

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