Pattern of fibre type distribution within muscle fascicles of pigs (Sus scrofa domestica)

Abstract

In order to determine breed differences in the fascicle structure of skeletal muscles, longissimus dorsi muscles (LD) and semimembranous muscles (SM), Duroc (D), Large White (LW), German Landrace (GL) and Swedish Landrace (SL) boars were analyzed. Fibre type delineation was based on the method of myofibrillar ATPase staining. The fibres in a fascicle were divided into layers according to their relation to the perimysium. In each layer, the proportions of fibre types I, IIA and IIB were determined and normalized according to the fibre type proportion in the whole fascicle. Generally, a high proportion of IIB fibres on the periphery, a prevalence of type I and IIA in the layer below, and altered proportions of type I, IIA and IIB in layer 3 were found to be the main characteristics of the distribution of fibres in a porcine fascicle. Breed dissimilarity was established in the arrangement of fibre types, particularly in the first and third layer. The breeds that showed the highest proportions of type I and IIB fibres in LD and SM muscles were GL and SL boars.

Neuropathological Characteristics of Brachial Plexus Avulsion Injury With and Without Concomitant Spinal Cord Injury

“…Notably, fiber-typing studies indicated a degree of preferential type II fiber atrophy, in contrast to the reported mixed fiber atrophy typical of neurogenic atrophy in humans. This may be related to the baseline differences in muscle fiber type pattern and distribution in swine, which have previously been shown to vary with multiple factors including age and strain (77)(78)(79). Furthermore, some reports indicate regions with a baseline predominance of type II fibers, consistent with what we observed (77).…”

“…This may be related to the baseline differences in muscle fiber type pattern and distribution in swine, which have previously been shown to vary with multiple factors including age and strain (77)(78)(79). Furthermore, some reports indicate regions with a baseline predominance of type II fibers, consistent with what we observed (77). Thus, the observed differential atrophic fiber type response may be a swine-specific phenomenon.…”

Software for muscle fibre type classification and analysis

“…The programme was successfully applied with human ( Pernuš and Eržen, 1991 ; Snoj-Cvetko and Eržen, 1992 ; Meznarič-Petruša et al , 1992 ; Pernuš and Eržen, 1994 ; Travnik et al , 1995 ; Čebašek et al , 1996 ; Eržen et al , 2000 ; Dahmane et al , 2001 ) and pig muscles ( Škorjanc et al , 2007 ), proving itself to be a useful tool. However, it was necessary to manually lay the photos on the tablet and all judgements were left upon the decision and experience of the human operator.…”

Origem e distribuição do nervo isquiático em fetos de suínos (Sus scrofa domesticus - Linnaeus, 1758) da linhagen Dan Bred

“…Estudos têm sido realizados sobre o Sus scrofa domesticus no que se refere a órgãos urinários (FLETCHER, 1967), articulações (FUSS, 1991) e músculos (SKORJANC et al, 2007). No entanto, estudos pormenorizados utilizando a linhagem Dan Bred são escassos (França, 2015), especialmente no que se refere ao plexo lombossacral e seus ramos.…”