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Comparison of different traits to evaluate the growth of bulls

Author

Listed:
  • J. Přibyl

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

  • J. Přibylová

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

  • H. Krejčová

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

  • N. Mielenz

    (University of Halle-Wittenberg, Halle, Germany)

Abstract

The live weights of 8 243 performance-tested bulls from 100 to 400 days of age were analysed using random regression (RR) and single-trait animal models. Evaluations were done for live weight at 400 days of age and gains from 100 to 400 days of age at various monthly intervals. Estimates of variance components differed depending on the trait definition and model of analysis. Systematic environmental effects explained a higher proportion of variability in the RR for gains than for other definitions of growth. The expected average reliability of estimated breeding values was similar for all methods from 0.42 to 46, but the rankings of animals differed. Determinations (r2) of breeding values between methods ranged from 0.64 to 0.94. Correlations of the breeding values of progeny at performance-test stations with parents were highest for the evaluation of gains in consecutive intervals evaluated by RR. Correlations of the breeding values of sires from their growth at performance-test stations with the breeding values of groups of progeny at progeny-test stations were from 0.26 to 0.38. Correlations were the highest for RR evaluations of gain using consecutive short intervals. Evaluation of the growth of animals according to daily gains in short consecutive intervals was preferred because more animals and more observations per animal were included in the evaluations, and the growth curve was separated into genetic and non-genetic parts. Simple evaluation of growth according to the final weight or daily gain in a long interval is not entirely correct, since environmental compensatory growth can occur.

Suggested Citation

  • J. Přibyl & J. Přibylová & H. Krejčová & N. Mielenz, 2008. "Comparison of different traits to evaluate the growth of bulls," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 53(7), pages 273-283.
  • Handle: RePEc:caa:jnlcjs:v:53:y:2008:i:7:id:357-cjas
    DOI: 10.17221/357-CJAS
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    References listed on IDEAS

    as
    1. J. Přibyl & H. Krejčová & J. Přibylová & I. Misztal & J. Bohmanová & M. Štípková, 2007. "Trajectory of body weight of performance tested dual-purpose bulls," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 52(10), pages 315-324.
    2. J. Wolf & E. Žáková & E. Groeneveld, 2005. "Genetic parameters for a joint genetic evaluation of production and reproduction traits in pigs," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 50(3), pages 96-103.
    3. J. Přibyl & H. Krejčová & J. Přibylova & I. Misztal & S. Tsuruta & N. Mielenz, 2008. "Models for evaluation of growth of performance tested bulls," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 53(2), pages 45-54.
    4. H. Krejčová & J. Přibyl & J. Přibylová & M. Štípková & N. Mielenz, 2008. "Genetic evaluation of daily gains of dual-purpose bulls using a random regression model," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 53(6), pages 227-237.
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    Cited by:

    1. M. Gholizadeh & G. Rahimi Mianji & M. Hashemi & H. Hafezian, 2010. "Genetic parameter estimates for birth and weaning weights in Raeini goats," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 55(1), pages 30-36.

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