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Genetic parameters of a random regression model for daily feed intake of performance tested French Landrace and Large White growing pigs

Genetics Selection Evolution volume 33, Article number: 635 (2001) Cite this article

An Erratum to this article was published on 15 March 2002

Abstract

Daily feed intake data of 1 279 French Landrace (FL, 1 039 boars and 240 castrates) and 2 417 Large White (LW, 2 032 boars and 385 castrates) growing pigs were recorded with electronic feed dispensers in three French central testing stations from 1992–1994. Male (35 to 95 kg live body weight) or castrated (100 kg live body weight) group housed, ad libitum fed pigs were performance tested. A quadratic polynomial in days on test with fixed regressions for sex and batch, random regressions for additive genetic, pen, litter and individual permanent environmental effects was used, with two different models for the residual variance: constant in model 1 and modelled with a quadratic polynomial depending on the day on test dmas follows in model 2: . Variance components were estimated from weekly means of daily feed intake by means of a Bayesian analysis using Gibbs sampling. Posterior means of (co)variances were calculated using 800 000 samples from four chains (200 000 each). Heritability estimates of regression coefficients were 0.30 (FL model 1), 0.21 (FL model 2), 0.14 (LW1) and 0.14 (LW2) for the intercept, 0.04 (FL1), 0.04 (FL2), 0.11 (LW1) and 0.06 (LW2) for the linear, 0.03 (FL1), 0.04 (FL2) 0.11 (LW1) and 0.06 (LW2) for the quadratic term. Heritability estimates for weekly means of daily feed intake were the lowest in week 4 (FL1: 0.11, FL2: 0.11) and week 1 (LW1: 0.09, LW2: 0.10), and the highest in week 11 (FL1: 0.25, FL2: 0.24) and week 8 (LW1: 0.19, LW2: 0.18), respectively. Genetic eigenfunctions revealed that altering the shape of the feed intake curve by selection is difficult.

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Authors and Affiliations

  1. Institute of Animal Science, Swiss Federal Institute of Technology (ETH), 8092, Zurich, Switzerland

    Urs Schnyder, Andreas Hofer & Niklaus Künzi

  2. Institut technique du porc, La Motte au Vicomte, BP 3, 35651, Le Rheu Cedex, France

    Florence Labroue

  3. Swiss Brown Cattle Breeders' Federation, Chamerstrasse 56, 6300, Zug, Switzerland

    Urs Schnyder, Andreas Hofer, Florence Labroue & Niklaus Künzi

Authors
  1. Urs Schnyder
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  2. Andreas Hofer
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  3. Florence Labroue
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  4. Niklaus Künzi
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Correspondence to Urs Schnyder.

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An erratum to this article is available at https://doi.org/10.1186/1297-9686-34-2-269.

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Schnyder, U., Hofer, A., Labroue, F. et al. Genetic parameters of a random regression model for daily feed intake of performance tested French Landrace and Large White growing pigs. Genet Sel Evol 33, 635 (2001). https://doi.org/10.1186/1297-9686-33-6-635

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  • DOI: https://doi.org/10.1186/1297-9686-33-6-635

Keywords

Genetics Selection Evolution

ISSN: 1297-9686