SUUMARY. Polymorphism of prolactin and growth hormone genes in two Ukrainian breeding chicken lines of meat-laying (G-2) and eggs performance (A) direction of productivity was studied. Polymorphism of the 24 bp insertion/deletion in the promoter region of prolactin gene, SNP in the –2402 position of the prolactin gene, the first intron of the growth hormone gene was investigated. Frequencies of I and D alleles in line G-2 and line A were 0,135, 0,865 and 0,730, 0,270; frequencies of C and T alleles – 0,155, 0,845 and 0,745, 0,255; frequencies of A, B and C alleles – 0,435, 0,395, 0,170 and 0,670, 0,160, 0,170 respectively. The results indicate that high frequency of I, C and A alleles in line A corresponds to the egg performance direction.
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