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Genet. Sel. Evol.
Volume 33, Number 6, November-December 2001
Page(s) 635 - 658
DOI: 10.1051/gse:2001105

Genet. Sel. Evol. 33 (2001) 635-658

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

Urs Schnydera, Andreas Hofera, Florence Labroueb and Niklaus Künzia

a  Institute of Animal Science, Swiss Federal Institute of Technology (ETH), 8092 Zurich, Switzerland
b  Institut technique du porc, La Motte au Vicomte, BP 3, 35651 Le Rheu Cedex, France

(Received 28 July 2000; accepted 21 June 2001)


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 dm as follows in model 2: $\sigma _{\varepsilon _m }^2 = \exp
\left( \gamma _0 + \gamma _1 d_m + \gamma _2 d_m^{ 2} \right)$. 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.

Key words: random regression / variance component / Gibbs sampling / feed intake / pig

Correspondence and reprints: Urs Schnyder

© INRA, EDP Sciences 2001