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Abstract
1. Early, M. pubo‐ischio‐femoralis pars medialis (PIF muscle) and late, M. iliotibialis lateralis pars postacetabularis (ITL muscle), maturing muscles were studied. These two muscles contained different populations of histo‐chemical fibre types.
2. The profile measurements of the muscles showed diphasic allometric growth relative to the weights. In the early stage of growth (up to 15 weeks after hatching), the muscle length, width and depth all increased, while in the later stage (from 15 to 35 weeks) muscle growth resulted mainly from the marked increase in the depth and to a lesser degree, from an increase in the width.
3. Type I fibres, observed predominantly in PIF muscle matured earlier than the Type II fibres of ITL muscle.
4. From these results, the detailed process of skeletal muscle growth in the chicken was discussed.
Notes
Present address: Kyudou Laboratory of Safety Assessment, Tashiro‐hokamachi 557, Tosu‐shi 841, Japan.
