J. Anim Sci.
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Published online first on October 13, 2006
J. Anim Sci. 1990. doi:10.2527/jas.2006-190
© 2006 American Society of Animal Science
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J. Anim Sci., doi: 10.2527/jas.2006-190
©Copyright, 2006, The American Society of Animal Science

ARTICLE

Could PSE Condition be explained by Distinctive Histological Characteristics?

Michel Franck 1*, P. Figwer 1, C. Godfraind 2, M. T. Poirel 1, A. Khazzaha 1, M. M. Ruchoux 3

1 Ecole Nationale Veterinaire de Lyon, Laboratoire de Zootechnie, 69280 Marcy L'Etoile, France
2 Neuropathology department. Clinique St Luc. ULB, 1200 Bruxelles Belgique.
3 INSERM U689 Lariboisière, 75475 Paris & CEA Fontenay-aux-Roses 92265 France.

* To whom correspondence should be addressed. E-mail: m.franck{at}vet-lyon.fr.


  Abstract

The pork quality depends on various genetic and environmental factors. Despite the improvement of slaughter conditions, PSE-type is still one of the main concerns in this field. This study was conducted on non-stressed animals to evaluate the tissue characteristics of some muscles usually involved during stress compared to a reference muscle: the Triceps brachialis which is actually not subject to stress-caused damages. Samples of Triceps brachialis, Longissimus dorsi, Biceps femoris and Semimembranosus were taken from pigs exhibiting one of the three HAL genotypes (NN, Nn and nn) and two of the three RN genotype (rn+rn+ and rn+RN-). Histoenzymology and immunohistochemistry were used to compare fiber typing and capillary network in these muscles within these different stress susceptibility genotypes. In comparison with the reference muscle "Triceps brachialis", the combination of a high value of the number of type IIb fibers and a low vascular network showed a primary impact on muscles usually involved during stress. This led to define a PSE index. A dramatic increase (P < 0,001) in this PSE index was systematically found in muscles usually involved in PSE-type condition. These results show that distinctive histological characteristics elicited the vulnerability of some muscles independently on genotypes. Moreover, this study highlights the distinctive histological features of each genotype and is likely to suggest some interactions between them.

Key Words: Halothane, Histology, Meat quality pigs, RN




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