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Cortisol-binding globulin and meat quality in five European lines of pigs¹

N. A. Geverink^*, A. Foury^*, G. S. Plastow, M. Gil, M. Gispert, M. Hortós, M. Font i Furnols, G. Gort, M. P. Moisan^* and P. Mormède^*,2

^* Laboratoire de Neurogénétique et Stress, INRA Institut François Magendie, 33077 Bordeaux cedex, France; and Sygen International, 2 Kingston Business Park, Kingston Bagpuize, Oxfordshire, OX13 5FE, United Kingdom; and IRTA, Centre de Tecnologia de la Carn, Granja Camps i Armet, 17121 Monells, Spain; and and Biometris, Wageningen University and Research Center, P.O. Box 100, 6700 AC Wageningen, The Netherlands

² Corresponding author: mormede{at}bordeaux.inserm.fr

The gene (Cbg) encoding cortisol-binding globulin (CBG) has been proposed as a candidate gene to explain genetic variation in cortisol secretion and carcass composition in pigs. The objective of this study was to evaluate the association between CBG and pork quality in 5 European breeding lines, Piétrain, Large White (LW), and Landrace purebred lines, a Duroc synthetic line, and a Meishan (MS) x LW advanced intercross. Cortisol-binding globulin maximum binding capacity (CBG-Bmax) was twice as high (P < 0.05) in MS x LW pigs compared with the other lines. There was no (P 0.364) association between CBG-Bmax and carcass quality traits in Piétrain gilts, but CBG-Bmax was associated with increased loin yields in LW (P = 0.010) and Landrace (P = 0.103) gilts, decreased ham yields (P = 0.082) in Duroc gilts, and increased fat depth (P = 0.064) and leaf fat (P = 0.001) in MS x LW gilts. There was no association between CBG-Bmax and pork quality traits in Piétrain (P 0.269) and Duroc (P 0.114) gilts. Conversely, CBG-Bmax was associated with lighter (higher L* values; P < 0.05) pork in Land-race gilts, as well as lower (P 0.055) ultimate pH in the LM and semimembranosus, and a tendency for lower (P = 0.095) L* values of pork from LW gilts. Within MS x LW pigs, CBG-Bmax was associated with increased drip loss (P = 0.001) and decreased i.m. fat in the semimembranosus (P = 0.005). Because drip loss is an economically important pork quality trait, results of this study could be used in the selection of improved water-holding capacity of pork from synthetic lines involving the MS breed.

Key Words: cortisol-binding globulin • drip loss • gilt • meat quality • pork

This article has been cited by other articles:

				V. Guyonnet-Duperat, N. Geverink, G. S. Plastow, G. Evans, O. Ousova, C. Croisetiere, A. Foury, E. Richard, P. Mormede, and M.-P. Moisan Functional Implication of an Arg307Gly Substitution in Corticosteroid-Binding Globulin, a Candidate Gene for a Quantitative Trait Locus Associated With Cortisol Variability and Obesity in Pig Genetics, August 1, 2006; 173(4): 2143 - 2149. [Abstract] [Full Text] [PDF]