The article presents the results of the study of productive indicators and features of the exterior of the trunk and morphological properties of the udder of first- heifer cows of Jersey breed. The research was carried out in the herd of the breeding farm Society of limited liability “TopalBereket”, town Comrat on first-heifer cows of Jersey breed. Analysis of milk productivity of the pedigrees of female ancestors of first-calf heifers showed that the highest milk yield and fat content were at the mothers of fathers - 8772 kg of milk and 6.02% of fat. On average, the milk yield of first-calf cows for 305 days of the first complete lactation was 4660 kg of milk with a fat content of 5.96%, the amount of milk fat - 276 kg. Exterior assessment showed that the height at the withers of the first Jersey heifers averaged 126.0 cm, and the height at the croup was 131.1 cm. The chest is deep and wide and averaged 63.7 cm and 40.5 cm, respectively. The bone is thin - the girth of the pastern is 16.6 cm. First heifers of the Jersey breed are characterized by a compact physique with an undercut index of 115.7%, which is characteristic to them during the studied period of development. The relationship between girth and width of the udder and milk yield per lactation of Jersey first-calf cows is weak and positive and amounts to 0.092 and 0.102, respectively. The correlation between the length, width and girth of the udder and the fat content in milk is weak and amounts to +0.123, +0.053 and +0.158, respectively.