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Communication Dans Un Congrès Année : 2012

Genetics of residual feed intake in the growing pig: relationships with nitrogen and phosphorous excretion

Résumé

The aim of this study was to evaluate residual feed intake (RFI), which is the difference between observed daily feed intake (DFI) and predicted feed intake from production and maintenance requirements, as a selection criterion to improve feed efficiency in commercial pig breeds, and its potential to reduce the proportions of nitrogen (Nratio) and phosphorus (Pratio) excreted relatively to intake. Data were collected in French central test stations between 2000 and 2009 for four pig breeds with different selection objectives: Large White (LWD, n=10,694) and French Landrace (LR, n=6,470) dam breeds and Large White (LWS, n=2,342) and Piétrain (PP, n=2,807) sire breeds. The RFI equations were computed separately for each breed. Nratio and Pratio during the test period (35-110 kg) were estimated from feed intake, body composition and body weight gain. Genetic parameters were then computed. The RFI accounts for about 29% of the phenotypic variability of DFI for LWD, LWS and LR and 20% for PP. Heritability estimates for RFI range from 0.22±0.03 (LWD, LWS, LR) to 0.33±0.05 (PP). The RFI shows favorable genetic correlations with feed conversion ratio (FCR), Nratio and Pratio. Predicted responses to a 5 years selection program based on current selection indexes are an increase of RFI in dam breeds (+0.24 to +0.35 SD) and a moderate reduction in sire breeds (-0.06 to -0.11 SD). Moreover, Nratio and Pratio are expected to decrease in all breeds to varying extent according to the breed (-0.38 to -1.16 SD for Nratio; -0.38 to -0.98 SD for Pratio). New selection indexes using RFI rather than FCR as a selection criterion can improve feed efficiency, growth and carcass traits while reducing nitrogen and phosphorus excretion.
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Dates et versions

hal-02745782 , version 1 (03-06-2020)

Identifiants

  • HAL Id : hal-02745782 , version 1
  • PRODINRA : 179927

Citer

Romain Saintilan, I. Mérour, Ludovic Brossard, Thierry Tribout, Jean-Yves Dourmad, et al.. Genetics of residual feed intake in the growing pig: relationships with nitrogen and phosphorous excretion. 63. Meeting of the European Association for Animal Production (EAAP), Aug 2012, Bratislava, Slovakia. pp.272. ⟨hal-02745782⟩
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