Abstract
The muscle fibre-type properties of longissimus were compared between Landrace and Yorkshire breeds and between the sexes in an attempt to shed light on the relationship of these histochemical parameters to animal growth and carcass composition. Muscle fibres were classified into three groups, type I, type lIA and type 11B, using the myosin ATPase method. At a given live weight, the cross-sectional area of type I fibres (CSA1) was smaller (p
Highlights
The muscle fibre-type properties of longissimus were compared between Landrace and Yorkshire breeds and between the sexes in an attempt to shed light on the relationship of these histochemical parameters to animal growth and carcass composition
The muscles of wild pigs have a higher percentage of type I and type lIA fibres and a lower percentage of type 118 fibres than do domestic pigs, and the cross-sectional area of type fibres (CSA) of muscle fibres is smaller in wild pigs than in domestic pigs at the same live weight (Bader 1983)
A positive correlation has been found between the percentage of type 118 fibres in longissimus and the CSA of pork loin (Bader 1981,Fiedler and Otto 1982, Wegner and Ender 1990, Fewson et al 1993)
Summary
The muscle fibre-type properties of longissimus were compared between Landrace and Yorkshire breeds and between the sexes in an attempt to shed light on the relationship of these histochemical parameters to animal growth and carcass composition. At a given live weight, the crosssectional area of type I fibres (CSA,) was smaller (p
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