Morphological characteristics of muscle fibres of m. longissimus lumborum in crossbreed fatteners with different proportion of Hampshire breed
2006
Wojtysiak, D.,Krakow Agricultural University (Poland). Dept. of Reproduction and Animal Anatomy | Migdal, W.,Krakow Agricultural University (Poland). Dept. of Animal Products Technology
On 46 fatteners from 3 different genotypes group muscle fibres traits of m. longissimus lumborum (LL) were examined. Samples of muscle were taken to categorize muscle fibres according to their mATP-ase activity (I, IIA and IIB). Muscle fibre percentage, cross-sectional area (CSA), relative area (RA) and phenotypic correlation between traits of muscle fibres were estimated. Moreover, percentage of giant muscle fibres was examined. The obtained results indicated that genotype had effect on muscle fibre composition. The greatest CSA of all examined muscle fibre types was found in fatteners with 25 percent Hampshire bloodlines. Moreover, crossbreeds with the lowest percentage of Hampshire breeds had a higher percentage and RA of type IIB fibres and a lower percentage and RA of type I fibres compared to other group. Additionally, phenotypic correlation between fibre types percentages were negative, in contrast to positive correlation between fibre type CSA. Fibre type RA was much more closely related to fibre percentages than to CSA. Moreover, percentage of giant muscle fibres positively low correlated with frequency and RA of type IIB fibres
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