@article{Krugliak_Krugliak_2020, title={VARIABILITY AND HEREDITY OF THE BULL`S BREEDING VALUE OF DIFFERENT GENEALOGICAL FORMATIONS OF THE HOLSTEIN BREED}, volume={59}, url={https://abg-journal.com/index.php/journal/article/view/267}, DOI={10.31073/abg.59.06}, abstractNote={<p>The results of analytical studies of breeding value variability on the basis of milk productivity, selected for reproduction of bulls of different genealogical formations of Holstein breed, are presented. A statistically significant difference between the breeding value of the milk yield of bulls and their parents of different genealogical groups was established.</p> <p>The variability of bulls breeding traits and the milk productivity of their daughters in the middle of genealogical formations was dominated by similar indicators between genealogical formations.</p> <p>In the middle of related genealogical formations, animals of new generations significantly outnumbered animals of earlier generations in level of breeding value.</p> <p>The high correlation between breeding value of milk yield, milk fat and protein of parents and their sons was identified. The highest correlation coefficient (r&nbsp;=&nbsp;+0.643&nbsp;±&nbsp;0.030) was established between the absolute milk productivity of daughters for 305&nbsp;days of first lactation and the level of breeding value of milk yield of their parents, which decreased sharply when compared with their ancestors of older generations.</p> <p>It was also established, that the breeding value of the animals of the new genealogical formations (sons, fathers, mothers) of Tradition&nbsp;1682485 and Valiant&nbsp;1650414 was always higher (on 161.2; 121.4; 209.4&nbsp;kg worth), compared to the older related groups of Elevation and Chief, on which basis they have been formed. This indicates about decreasing of appearance frequency of leader bulls in a single related group during breeding.</p> <p>The sons of these bulls inherit the signs of milk productivity, their breeding value exceeded that of their parents: by milk fat – by 2.4–20.0&nbsp;kg, total protein – by 0.7–11.8&nbsp;kg. The absolute milk production of their daughters in the 305&nbsp;days of the first lactation was 11201–13173&nbsp;kg of milk, 411–475&nbsp;kg of milk fat and 337–383&nbsp;kg of total protein, which exceeded the productivity of their contemporarys by 113–1025&nbsp;kg of milk, 8.6–55.6&nbsp;kg milk fat and 9.3–30.3&nbsp;kg total protein.</p> <p>A similar predictable of variability of the breeding value of animals of different genealogical formations of the Holstein breed for milk fat and protein in milk was established.</p> <p>The level of breeding value of the fathers has the greatest influence on the level of milk production of their daughters of the Holstein breed (the influence force is 35.1%).</p> <p>In second place was the force of influence breeding value of the father-fathers on the milk yield of their granddaughters, which was 11.7%. The third place was occupied by the influence of the breeding value of mothers on the level of milk productivity of their daughters (η<sup>2</sup><sub>х</sub>&nbsp;=&nbsp;10,6%). These forces of influence of these ancestors on the level of milk productivity of the firstborn cows are statistically significant (P&nbsp;&lt;&nbsp;0.05–0.001).</p> <p>The last place of force of influence (η<sup>2</sup><sub>х</sub>) on the level of milk productivity of the firstcalve heifers take the male ancestors, who are in their third line of pedigree (FFF), it was 2.7% and was not statistically significant.</p&gt;}, journal={Animal Breeding and Genetics}, author={Krugliak, A. P. and Krugliak, T. O.}, year={2020}, month={May}, pages={51-59} }