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Estimation of (co)variance components for Jersey type traits using a repeatability model

N Gengler1, G R Wiggans, J R Wright

  • 1Fonds National Belge de la Recherche Scientifique, Unité de Zootechnie, Faculté Universitaire des Sciences Agronomiques, Gembloux, Belgium.

Journal of Dairy Science
|August 1, 1997
PubMed
Summary

New heritability estimates for Jersey cows reveal higher genetic potential for traits like final score and udder conformation. These findings are crucial for improving genetic evaluations in dairy cattle breeding programs.

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Corrigendum to "Changes in genetic trends in US dairy cattle since the implementation of genomic selection" (J. Dairy Sci. 106:1110-1129).

Journal of dairy science·2023

Area of Science:

  • Animal Genetics
  • Dairy Science
  • Quantitative Genetics

Background:

  • Accurate estimation of genetic and non-genetic variance components is essential for effective genetic evaluations in dairy cattle.
  • Previous estimates for Jersey cows were based on older data, potentially not reflecting current genetic trends or management practices.

Purpose of the Study:

  • To estimate (co)variance components for final score and 15 linear type traits in Jersey cows using a large, modern dataset.
  • To update heritability and repeatability estimates for use in multitrait genetic evaluations.

Main Methods:

  • Multitrait restricted maximum likelihood (REML) analysis was employed.
  • A repeatability model incorporating multiple diagonalization was used with 34,999 records from 22,354 Jersey cows.

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  • The accuracy of the method was confirmed by low relative off-diagonal values (<0.1%).

    • Main Results:

    • Heritability estimates for most traits were higher than previously reported, with values ranging from 0.13 (foot angle, rear legs side view) to 0.40 (stature).
    • Repeatability estimates were generally lower than heritability, ranging from 0.25 (foot angle, rear legs side view) to 0.57 (stature).
    • Final score showed high genetic and phenotypic correlations with dairy form and rear udder traits.

    Conclusions:

    • The updated heritability and repeatability estimates provide a more accurate basis for genetic evaluations of US Jersey populations.
    • These estimates are vital for implementing effective multitrait genetic selection strategies for linear type traits.
    • The study highlights the importance of regularly updating genetic parameters with contemporary data.