The study carried out morphological investigations using light and electron microscopes on the muscles of BUT 9 and Big 6 turkeys reared in two different types of conditions - indoor and outdoor (poultry yard with roof shelter). Musculus pectoralis superficialis and musculus gastrocnemius were collected from male turkeys slaughtered at 16 weeks of age. The tissues were subjected to histochemical and ultrastructure investigations, including morphometric analysis. There were no significant differences in the histology and ultrastructure characteristics of the muscles between BUT 9 and Big 6 turkeys. However, clear differences in these characteristics were observed between the two types of rearing. Degenerative changes including focal necrosis, infiltration by mononuclear cells, smaller capillary to fiber ratio and the formation of electron dense deposits, the absence of glycogen and sarcoplasm disintegration were often found in turkeys reared indoors. These structural alterations appeared to be related to partial muscle ischemia. Outdoor rearing, which enables exercise, has a beneficial effect on muscle structure.
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