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The objective of this study was to verify the presence of giant fibres in the Black Sicilian pig skeletal\udmuscle and to evaluate the effect of sex on histochemical and morphometric characteristics of the\udmyocytes (myofibres) as well as vascularity of the muscle. Twenty Black Sicilian pigs (10 males, 10\udfemales) from a farm in Sicily (Italy) were slaughtered at two years of age. Muscle tissues were\udobtained from three muscles: psoas major, longissimus dorsi, and trapezius. Myofibres were stained\udfor myosin ATPase, succinic dehydrogenase, and α-amylase-PAS. For all fibre types, area and\udperimeter were measured. Slow-twitch oxidative fibres, fast-twitch glycolytic fibres and fast-twitch\udoxidative-glycolytic fibres were histochemically differentiated; an image-analyzing system was\udused. The results showed no differences between males and females in percentage of the fibre types,\udbut there were significant differences between sexes in size of all the three fibre types. Psoas major\udmuscle had a high percentage of slow-twitch oxidative fibres and contained more capillaries per fibre\udand per mm2 than trapezius and longissimus dorsi, in which fast-twitch glycolytic fibres dominated.\udThe cross-sectional area of all fibres types was larger in longissimus dorsi than in trapezius and psoas\udmajor muscles; the giant fibres were absent in all the muscles studied. Fibre type composition may\udcontribute to the variation of meat quality

Skeletal Myocyte Types and Vascularity in the Black Sicilian Pig