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

Autori
Gjurčević-Kantura, Vesna ; Mikulec Krešimir ; Zobundžija Mladen ; Sušić Velimir ; Mihelić Damir ; Mikulec Željko ; Vučemilo, Marija

Izvornik
Czech Journal of Animal Science (1212-1819) 44 (1999), 10; 463-469

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Lamb. Crossbreds; Muscle fiber diameter; Enzymatic activity
(Lamb. Crossbreds; Muscle fiber diameter; Enzymatic activity.)

Sažetak
Diameters and types of muscle fibers were studied on the basis of histochemical activity of lactic (LD) and succinic (SD) dehydrogenase and myosin adenosine triphosphatase (ATP-ase) at pH 4.3 in in. gluteobiceps, in. longissimus lumborum, nl. psoas major, m. semitendinosus, m. sernimembmnosus, In. quadriceps femoris (m. rectus femoris) and m, triceps brachii (caput longum) of 9 male lambs originating from the crossbred F-2 between the Istrian Pramenka and Sardinian (S), Domestic Merino-Wurtemberg (W) and East Friesian (EF) rams 71 days old, weighing 21.74 kg (S), 25.66 kg (W) and 25.43 kg (EF). Diameter of the fibers and enzymatic activity were different in all investigated muscles. The diameter ranged from 10 to 90 mu m (S), 10-85 mu m (W) and 10-70 mu m (EF). The largest average diameter in majority of muscles was recorded in the S lambs, and the largest number of fibers in the visual field was in the W and EF animals. Glycolytic fibers were the most common, comprising around or over one half of all fibers ; oxidative made about one third of all fibers and oxidative-glycolytic were less common than oxidative. The slow-twitch fibers accounted for around one third and the fast-twitch for around two thirds in all investigated muscles. M. longissimus lumborum, m. semitendinosus, in. semimembranosus and m. quadriceps femoris of the S lambs, then in. gluteobiceps and in. triceps brachii of the W lambs and m. psoas major of the EF lambs contained the most oxidative fibers. Glycolytic fibers were mostly in in. longissimus lumborum, m. semitendinosus, m. quadriceps femoris and m. triceps brachii (W lambs) and in m. gluteobiceps, m, psoas major and in. semimembranosus (S lambs). Majority of the slow-twitch fibers were in m. semitendinosus, m. semimembranosus, m. quadriceps femoris and m. triceps brachii of the S lambs, in nl. gluteobiceps and m. psoas major of the W lambs and in in, longissimus lumborum of the EF lambs. The most of the fast-twitch fibers were in m. gluteobiceps, in. psoas major, m. semimembranosus and in. triceps brachii of the EF lambs, and in. longissimus lumborum, m. semitendinosus and in. quadriceps femoris of the W lambs. Statistical evaluation shows the significant differences (P < 0.01) in muscle fiber average diameter in each muscle order between all three crossbreds or only between two crossbreds. 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 fibers than to the muscle fiber thickness.

Izvorni jezik
Engleski

Znanstvena područja
Veterinarska medicina

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