Characteristics of muscle fibres in bulls with regard to growth intensity and fat rate in carcasses
1993
Skorjanc, D. | Cepon, M. (Biotechnical Faculty, Ljubljana (Slovenia). Zootechnical Dept.) | Erjavec, M. (College of Agriculture, Maribor (Slovenia))
On the basis of myosin ATPase activity (Padykula and Herman, 1955), muscle fibres were divided into types I and Il, and into red (R) and white (W) fibres on the basis of their SDHase activity (Nachlas et al, 1957). By means of a computer - aided method (Pemus et al, 1986) it was possible to measure the minimal diameter, area and extent of each muscle fibre on the photographs. In 1 mm of sample area (Osterc, 1974) the number of muscle fibres in each type was determined with a higher fat percentage in the carcasses rate of R fibres decreased, while the rate of W fibres in musculus longissimus dorsi (MLD) increased with higher daily gain the rate of type I muscle fibres decreased and the rate of type II in MLD increased S sires had statistically significant effect on the rate of all muscle fibres types, while the genotype of S*M sires had statistically significant effect on the analyzed characteristics of type I fibres, as well as on the number of type I and Il muscle fibres per l mm of the sample
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