It was observed milk productivity in cows of different genotypes of western intrabreed type of the Ukrainian black-and-white dairy breed. It is set that animals with different part of heredity of golshtyn differed for yield milk, content of fat in milk and amount of milk fat. For the first, second, third and the best lactations the greatest yields milk and amount of milk fat are from animals with the genotype of 5/8 black-and-white and 3/8 golshtyn. The greatest content of fat in milk for the first lactation was observed for cows with the genotype of 9/16 black-and-white and 7/16 golshtyn, for the second lactation – with genotype 5/8 black-and-white and 3/8 golshtyn, and for the third and the best lactations – for cows with the genotype of 1/2 black-and-white and 1/2 golshtyn. Depending on a lactation part of influence of genotype of cows on their the yield milk – 6,11-13,11, on content of fat in milk – 11,93-18,85 and on the amount of fat – 7,22- 14,93.