Studies carried out to evaluate the firstborn cows of Holstein breed (Ukrain-ian Black-and-White dairy with a conditional bloodline of Holstein above 93.75%) by confor-mation type. The research base was the breeding farm of PE "Buryns'ke" of Pidlisnivskyi branch in Sumy district. The modern method of linear classification used by two systems: 9-score, de-scribing 18 conformation body parts and 100-score, with a set of four selection traits defining the dairy type, body, limbs and udder. The population-genetic aspect determined by the herita-bility and correlative variability of linear traits with milk yield of Holstein cows of domestic breeding in Sumy region. Group traits characterizing the dairy type of cows (r = 0.398), body development (r = 0.412), limb condition (r = 0.215), udder morphological qualities (r = 0.466) and final score best correlated with milk yield (r = 0.474). The highest coefficients of heritability were found for the dairy type (h2 = 0.366), body (h2 = 0.328), udder (h2 = 0.385) and final score (h2 = 0.477). The average and moderate heritability level determined for descriptive traits: height (h2 = 0.286), body depth (h2 = 0.275), angularity (h2 = 0.414), rear width (h2 = 0.295), pelvic limbs posture (h2 = 0.274), fore (h2 = 0.351) and rear (h2 = 0.296) udder attachment and central ligament (h2 = 0.294). A sufficient heritability level and correlative variability between linear traits and milk yield allowed effectively select dairy cattle in the direction of improving the conformation and productivity.