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Selection for reduced muscle glycolytic potential in Large White pigs I. Direct responses

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  • [Sdv:Gen:Ga] Life Sciences/Genetics/Animal Genetics
  • [Sdv:Gen:Ga] Sciences Du Vivant/Génétique/Génétique Animale


Original article Selection for reduced muscle glycolytic potential in Large White pigs. I. Direct responses Pascale Le Roy Catherine Larzula Jean Goguéb André Talmant Gabriel Moninc Pierre Sellier a Station de génétique quantitative et appliquée, Institut national de la recherche agronomique, 78352 Jouy-en-Josas cedex, France Institut national de la recherche agronomique, domaine de Galle, 18520 Avord, France Station de recherches sur la viande, Institut national de la recherche agronomique, Theix, 63122 Saint-Genès-Champanelle, France (Received 3 March 1998; accepted 10 September 1998) Abstract - A six-generation selection experiment comprising a selected (S) and a control (C) line has been conducted with the objective of decreasing muscle glycolytic potential in purebred French Large White pigs. Both lines consisted of six to eight sires and about 40 dams per generation, and each dam produced two litters. The selection criterion in the line S was the in vivo glycolytic potential (IVGP) of the Longissimus (ld) muscle, measured on a shot-biopsy sample removed at 75 kg live weight on boars and gilts from first-parity litters. In addition, the post mortem glycolytic potential (PMGP) of ld, semime!n6ranosus (sm) and semispinalis capitis (sc) muscles was recorded on pigs from second-parity litters slaughtered at 100 kg live weight. Throughout the experiment, 2 981 and 454 animals were recorded for IVGP and PMGP, respectively. A consistent decrease in IVGP and, to a lesser extent, in PMGP was obtained in the line S compared with the line C. Estimates of genetic changes per generation were -0.18, -0.11, -0.07 and -0.09 SD units of the trait for IVGP and PMGP of ld, sm and sc muscles, respectively. The REML heritability estimates were 0.25 ! 0.02, 0.15 f 0.06, 0.14 ± 0.06 and 0.17 ! 0.05 for the above four traits, respectively. The REML estimate of genetic correlation of IVGP with PMGP ld (0.87 f 0.15) was somewhat higher than those of IVGP with PMGP of sm and sc (0.56 iL 0.14 and 0.68 t

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