EVALUATION OF BULL-SIRES BY THE EXTERIOR TYPE OF DAUGHTERS

The article presents the results of studies of Holstein breeding bulls by the exterior type of daughters using the linear classification method. The first-born cows of the herd breeding the Ukrainian Black-and-White Dairy breed of the company “Ukrlandfarming” of the PE “Burynske” of the Pidlisnivsky branch of the Sumy district were evaluated. The linear classification of the daughters of breeding bulls highlighted the intergroup differentiation according to the assessment indicators and the positive impact of Holsteinization on the formation of the desired dairy type in their offspring, as evidenced by the average level of the final assessment, which corresponds to the international scale of “good plus”. Evaluation of the complex of linear traits characterizing the expression of the dairy type on a 100-point scale revealed intergroup variability with a difference within the limits (81.7–84.9 points) of 3.2 points (P < 0.001). The dairy type is better expressed according to the evaluation indicators in the daughters of the bulls-breeders P. Altavarrant (84.6 points), V. River (84.8 points), J. Altatrill (84.8 points) and P. Ozon (84.9 points). The level of evaluations for the group of linear traits (82.8–85.7 points), indicating the development of the body, will allow the animals to cope with the physiological load, ensuring maximum productivity. The variability of the evaluations for the condition of the fore and hind limbs and hooves is within 82.7–84.7 points and also indicates the potential for long-term use of the evaluated cows in modern production conditions. The first-born cows with the highest final evaluation are the daughters of the bulls P. Altavarrant (84.8 points), V. River (84.6 points), J. Altatrill (84.8 points) and P. Ozon (84.9 points) are distinguished by higher scores for the complex of udder traits – 84.8; 84.6; 84.8 and 84.9 points, respectively. Sufficiently high scores for the morphological traits of the udders of the daughters of the named breeding bulls-improvers indicate their fairly good development, on which high milk yield, longevity and adaptability to machine milking depend. Variability of scores for 18 descriptive traits exists both within the assessed groups of daughters of breeding bulls, and in each group taken separately, with the lowest score of 4.2 and the highest – 8.2 points.