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Sélection pour abaisser le potentiel glycolytique du muscle chez le porc Large White. III. Réponses corrélatives pour la vitesse de croissance, la composition corporelle et les caractères de reproduction

Abstract : A six-generation selection experiment comprising a selected (S) and a control line (C), and aiming at decreasing muscle glycolytic potential has been conducted in purebred Large White pigs presumably free of the Haln and RN-alleles.Both lines consisted of six to eight sires and around 40 dams per generation. Each dam produced two litters with replacement boars and gilts kept from the firstparity litters. The selection criterion in the S line was the in vivo glycolytic potential (IVGP) of the longissimus muscle, measured on a shot biopsy sample removed at about 75 kg live weight. Correlated responses to selection for low IVGP as well as heritabilities and genetic correlations with IVGP were estimated for average daily gain (6 761 offspring from parities 1 and 2), ultrasonic backfat thickness (3 078 boars and gilts from parity 1), carcass composition traits (1 185 castrated males and gilts from parity 2), age at first oestrus (1084 gilts) and litter size and weight at birth, at 21 days of age and at weaning (917 litters). Heritability estimates of these traits were within the usual range of literature values. The estimates of genetic correlation (rA) with IVGP were 0.15 ± 0.07 for average daily gain, -0.32 ± 0.06 for ultrasonic backfat thickness, -0.20 ± 0.10 for carcass backfat thickness, -0.24 ± 0.09 for weight of backfat, 0.18 ± 0.09 for carcass lean meat percentage, and 0.49 ± 0.15 for loin muscle area. In agreement with the rA estimates pertaining to carcass composition traits, the most pronounced correlated response to downward selection on IVGP was a decrease of carcass lean to fat ratio in the S line compared with the C line. Genetic trends per generation amounted to -0.13, 0.12 and 0.16 phenotypic standard deviation units of lean meat percentage, backfat thickness and backfat weight, respectively. A negative rA estimate (-0.29±0.11) was found between age at first oestrus and IVGP, but there was no evidence for significant genetic relationships with IVGP or noticeable correlated genetic trends in the S line, regarding litter size and weight traits.
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  • HAL Id : hal-02689593, version 1
  • PRODINRA : 136460

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Catherine Larzul, Pascale Le Roy, Jean-Marcel Gogué, André Talmant, Gabriel Monin, et al.. Sélection pour abaisser le potentiel glycolytique du muscle chez le porc Large White. III. Réponses corrélatives pour la vitesse de croissance, la composition corporelle et les caractères de reproduction. Genetics Selection Evolution, BioMed Central, 1999, 31 (2), pp.149-161. ⟨hal-02689593⟩

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