Abstract
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Highlights
Histological and histochemical detection of myosin ATPase, succinate dehydrogenase (SDH) and glycogen activity were used to study seven topographically and functionally different muscles of 23 Duroc pigs aged 2-4 hours, 7 days, and I, 3 and 6 months
The muscle seemed to be relatively compact, and the primary, and sometimes even secondary, muscle bundles (MBs) were not clearly delineated. In spite of this predominant characteristic feature, the superficial zone of the muscle was less compact with clearly recognisable bundles, which did not lie close to each other, and neither did muscle fibres, which were circular in cross-section
We included myofibrils embedded in muscle fibres (MFs), subsarcolemmally located cell nuclei, a shift towards a polygonal CS, a tendency towards equalising thickness of the two populations of MFs and histochemical differentiation if MFs
Summary
Histological and histochemical detection of myosin ATPase, SDH and glycogen activity were used to study seven topographically and functionally different muscles of 23 Duroc pigs aged 2-4 hours, 7 days, and I, 3 and 6 months. The aim of the study was to find out whether type differentiation of muscle fibres (MFs) is detennined genetically or whether it is variable, and if so, in what ways, to what extent, and what is its relationship with "load myopathies", and to help answer the question of the "giant fibre", MF splitting, and of suitability of individual types of differentiation histochemical methods. Detection of SDH activity did not allow an objective type differentiation of MFs in piglets younger than I month. I.Kaman Sumavska 602 00 Bmo, Czech Republic morphological aspects of the muscle fibre present a host of questions related, in particular, to the type differentiation and MF distribution in the muscle bundle (MB), which determine the qualitative and quantitative character of the muscle
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