engleski

Histometabolic properties of some skeletal muscles in crossbred lambs of Croatian dairy sheep

Diameters and type of muscle fibres were studied on the basis of histochemical activity of lactice (LD) and succinic (SD) dehydrogenase and myosin adenosin triphosphatase (ATP_aze) at pH 4, 3 in m. gluteobiceps, m. longisimus lumborum, m. psoas major, m. semitendinosus, m. semimembranosus, m. quadriceps femoris (m. rectus femoris) and m. triceps brachii (caput longum) of 9 male lambs orginating from zhe crossbred F2 between the Istrian Premenka and Sardinian (S), Domestic Merino-Wutenberg (W) and East Friesian (EF) rams 71 days old, weiting 21, 74 Kg (S), 25, 66 Kg (W) and 25, 43 Kg (EF). The diamneter ranged from 10 to 90 um (S), 10-85um (W) and 10-70um (EF). The largest average diameter in majority of muscles wao recorded in the S lambs, and largest number of fibres in the visual field was in the W and EF animals. Glycolitic fibers were the most common, comprising around or over one half of all fibres ; oxidative made about one third and all fibers and oxidative- glycolitical were less common than oxidative. The show-twich fibers accounted for around one third and the last-twich for around two thirds in all investigated muscles. Statistical evaluation shows the significant differences (P<0.01) in muscle fiber average diameter in each muscle order between all tree crossbreds or only between two crossbred. The difference in body weight and consequently, in meat volume between the S, W and EF animals was also rather due to a larger number of muscle fibres than to the muscle fiber thicness.

lamb ; crossbreds ; muscle fiber diameter ; enzymatic activity

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