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With the intensification of animal husbandry, the importance of the animals' ability to adapt to changing environmental conditions and thus the properties with regard to conformation and constitution increases. Conformation and performance are closely related and reflect the metabolism of each individual. The aim of the research is to investigate the dynamics of age-related changes in conformation characteristics, the degree of mutual influence on milk yield and constitutional type of cows in the Holsteinized Holstein population of the Udmurt Republic (Russian Federation). In the examined population the animals have a strong, noticeably long and deep trunk, good parameters for the development of shoulder height, correctly positioned fore and hind limbs. The 305-day milk production of the animals examined was an average of 6085.12 kg in the first lactation and an average of 7047.56 kg of milk with a fat and protein content of 4.08% each in the second to fourth lactation; 3.86% (first lactation, group 1) and 3.02; 3.03% (second to fourth lactation, group 2). The production index is 6765.17 kg and 7628.52 kg. The conformation characteristics of straight trunk length, size of the femoral head, cannon bone circumference and sacrum length have a significant influence on the 305-day milk line in the first lactation. Criteria such as the depth of the chest, the size of the femoral head, the cannon bone circumference, the depth of the trunk, the width of the pelvis, the length of the sacrum and the length of the hip area have a certain influence on the fat and protein content and on the production index in general. The monofactorial dispersion analysis showed that the respective "measure for the conformation trait" influenced the examined performance traits to different degrees and varied between 0.3% and 12.2%. The analysis of the performance characteristics of cows with different body types showed that the influence of the factor "body type index" is only small and varies within 0.3 to 2.9%. The "index of the hip area" fluctuated between 0.2 and 7.7%. The greatest influence of the two index values "body type index" and "index of the hip area" was with regard to the milk quality characteristics fat content (2.9% and 7.7%) and ice white content (1.4% and 2.9%). [ABSTRACT FROM AUTHOR]