Research have been carried out on linear estimation of daughters of producing bulls of two new factory lines Prelude 392457 and Dzhastik 750034 according to constitution type, and analysis of productivity depending on the type obtained according to this assessment was carried out. The best among estimated producing bulls of Prelude 392457 line in the overall rating of the 100-score system were daughters of Email 100489 bull (93.6 scores), and the lowest - daughters of Positiv 750016 (80.5 scores). At increase in the category of cows, their productivity remained almost unchanged, except for productivity of cows with “excellent” score, which decreased by 418 kg compared with “good+” score, and difference between animals with “excellent” and “satisfactory” score made 565 kg . Among the bulls of Dzhastik 750034 line, producing bull Univers 750388 (92.7 scores) gained the highest total score, and producing bull Homer 750270 (87.2 scores) gained the lowest score. When increasing the category of cows, their productivity increases by 12, 223, 102 and 215 kg of milk, and the difference between categories “excellent” and “satisfactory” made 552 kg.