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Abstract: Polymorphism of insulin like growth factor IGF-1 gene in selected Polish sheep breeds. Research was carried out in 2009-2013 on 1,751 sheep bred in Poland (1366 ♀; 385 ♂) -4 meatwool breeds: Polish Merino, Old type Polish Merino, Corriedale and Żelaźnieńska sheep and 3 meat breeds (Berrichone du cher, Suffolk, Charolaise) from 34 fl ocks selected randomly across the country. All animals were subjected to identifi cation factor insulin-IGF-1 gene, in the assessment of C and T alleles. Summing up, it should be noted that in four meat-wool breeds and two meat breeds (Berrichone du cher, Suffolk) there were no polymorphism of alleles and genotypes of insulin-like growth factor (IGF-1) gene, limiting its scope to determine C allele and CC genotype. Only one Charolaise ewe (breed imported from France) had T allele and C:T genotype. That result indicates the need for further research about sheep imported and adapted in Polish production conditions and assess the adaptation process