Dairy productivity and reproductive ability of the third generation offspring of Holstein cattle of American selective breeding, imported to the breeding reproducer of JSC "Belgorod Dairy Farms", were studied by complex researches. The goal was achieved by solving the following tasks: the indicators of milk yield in the animals of the main lines for three complete lactations and the degree of realization of the genetic potential were determined; the indicators of milk yield, fat and protein content in the milk of female ancestors of experimental animals were studied; the reproductive capacity of the analyzed cows was estimated. During the research, the methods used in zootechnics were used. It has been established that the milk productivity of female ancestors of the 1st generation of the evaluated animals for 305 days of first lactation was an average of 7698 kg of milk or 438 kg lower than the milk productivity of daughters - animals of the 2nd generation. The highest milk yields were recorded in the cows of the W.B. Ideal line, 1st generation - 7801 kg and 2nd generation - 8235 kg. In terms of fat content in milk, the animals of the 1st generation of the M. Chieftain line excelled others, the fat content in their milk was 3.85%. The predicted milk yield in terms of cows’ parent index in the analyzed groups ranged from 9340 to 9476 kg of milk. The implementation of genetic potential for milk yield averaged 87%. The duration of the first complete lactation in the evaluated animals ranged from 377 to 396 days with an average milk yield of 9537 kg. For 305 days of the first three lactations, milk yield from the cows of the R. Sovereign line was on average 9181 kg of milk or 352 and 199 kg more compared to the lines of W.B. Ideal and M. Chieftain. The animals of the R. Sovereign line were also characterized by the high yield of milk fat (346.6 kg) and protein (302.1 kg). The average duration of the service and interim periods for the evaluated cows was 158 and 436 days. The indicators of the cows of the R. Sovereign line were shorter by 12 and 9 days. From the first insemination, 55.3% of the animals became pregnant. In the cows of M. Chieftain line this index was higher (62%). The coefficient of the reproductive ability of animals was recorded at the level of 0.84.
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