The pigeon has a lot of breeds that differ in their morphological and physiological characteristics from the ancestral form the rock dove. In some breeds of pigeons seeing a tumbling behaviour with genetic disposition that in really should be classify abnormal. In this study, the brain histomorphology of the clap tumbler (Takla) was compared with two pigeon breeds, which not show tumbling behaviour. The gross brain weight was significantly different regarding gender (P = 0.011). Furthermore, the Takla pigeon have a significantly lighter brain than the other breeds (P = 0.003). The allometry constant for the gross brain weight and live weight were b = 0.31 (P = 0.004). The values of Baska and Homer were above the regression line, most values of the Takla pigeons were below the regression line. Genotype and gender have on the molecular strata width and the width of the granular strata of cerebellum no significant effect (P ≥ 0.2013). However, the Baska pigeons have significantly fewer Purkinje cells per sq mm (P = 0.0400). Qualitative differences could not be established between the brain tissue preparations. The comparison of brain weights indicates a much smaller brain of Takla pigeon to the other breeds.

Key words: gross brain weight, cerebellum, molecular strata, granular strata, purkinje