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Breed differences in the histochemical properties of the M. pubo‐ischi‐ofemoralis pars medialis myofibre of domestic cocks

1993; Taylor & Francis; Volume: 34; Issue: 2 Linguagem: Inglês

10.1080/00071669308417587

1466-1799

Hidetoshi Iwamoto, Y. Hara, Yoshitaka Ono, Hikaru Takahara,

Genetic and phenotypic traits in livestock

Abstract 1. Histochemical properties of M. pubo‐ischio‐femoralis pars medialis (PIF muscle) were compared in 7 breeds of cocks. This muscle was largely composed of Type I fibres and their transitional form (Type I tr). Type IIA fibres were observed in the cranial part. 2. The weight and cross‐sectional area of the PIF muscle increased with increasing body weight. However, the relative muscle development to body weight differed among the 7 breeds. 3. A quarter of Type I fibres were of the transitional variety in bantam fowls. Conversely, few, if any, Type I tr fibres were observed in the large breeds where the muscle was poorly developed. 4. As the histochemical properties of Type I fibres made an effective response to the different body weights and the relative PIF muscle development among breeds, it was concluded that PIF muscle performed an important function in supporting the body weight and maintaining posture. Notes Present address: Kyudo Laboratory of Safety Assessment, Tashirohokamachi 557, Tosu‐shi 841, Japan.