Journal cover Journal topic
Archives Animal Breeding Archiv Tierzucht
Journal topic

Journal metrics

IF value: 0.991
IF0.991
IF 5-year value: 1.217
IF 5-year
1.217
CiteScore value: 2.0
CiteScore
2.0
SNIP value: 1.055
SNIP1.055
IPP value: 1.27
IPP1.27
SJR value: 0.425
SJR0.425
Scimago H <br class='widget-line-break'>index value: 28
Scimago H
index
28
h5-index value: 13
h5-index13
Supported by
Logo Leibniz Institute for Farm Animal Biology Logo Leibniz Association
Volume 50, issue 1
Arch. Anim. Breed., 50, 47–58, 2007
https://doi.org/10.5194/aab-50-47-2007
© Author(s) 2007. This work is distributed under
the Creative Commons Attribution 3.0 License.
Arch. Anim. Breed., 50, 47–58, 2007
https://doi.org/10.5194/aab-50-47-2007
© Author(s) 2007. This work is distributed under
the Creative Commons Attribution 3.0 License.

  10 Oct 2007

10 Oct 2007

Anpassung eines Fixed Regression Modells für die tägliche Zunahme von Fleckviehbullen mit Hilfe von Informationskriterien

N. Mielenz1, H. Krejčová1, J. Přibyl2, and L. Schüler1 N. Mielenz et al.
  • 1Institut für Agrar- und Ernährungswissenschaften der Martin-Luther-Universität Halle-Wittenberg, Halle, Germany
  • 2Forschungsinstitut für Tierproduktion Prag-Uhříněves, Prague, Czech Republic

Abstract. Title of the paper: Fitting a fixed regression model for daily gain of bulls using information criterion
In this study the model choice is demonstrated exemplarily on data of 6405 Czech Simmental bulls using information criterion. Per bull up to 8 observations were available for the trait daily gain. Because the animals showed different age on control day, the expected gain curves were described in the population and within the herd*year*season-classes by second, third or fourth order Legendre polynomials of age. For optimization of the fixed effects and to choice the covariance structure of the repeated records the information criteria of Akaike (AIC), the Bayesian criteria (BIC) and the ICOMP-criteria, developed mainly from Bozdogan, were used. Within and over all covariance structures AIC selected generally the most complex model. On the other hand, BIC and ICOMP favoured a model with second order polynomials of age nested within the head*year*seasonclasses. All criterion selected models with nested second order polynomials within the herd*year*season-classes in comparison to models with non-nested polynomials of age.

Download
Citation