Histometabolic properties of some skeletal muscles in crossbred lambs of Croatian dairy sheep
1999
Gjurcevic-Kantura, V. | Zobundzija, M. | Mihelic, D. (University of Zagreb (Croatia). Veterinary Faculty) | Mikulec, K. | Susic, V. | Mikulec, Z. | Vucemilo, M.
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 9 male lambs originating from the crossbred F2 between the Istrian Pramenka and Sardinian (S), Domestic Merino-Wuertemberg (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 micro m (S), 10-85 micro m (W) and 10-70 micro 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. 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 thickness.
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