CORRELATIVE VARIABILITY BETWEEN UDDER MEASUREMENTS AND DESCRIPTIVE TRAITS OF LINEAR CLASSIFICATION FIRST-BORN COWS OF DAIRY BREEDS OF DOMESTIC SELECTION
Abstract
Research on the study of correlative variability between udder measurements and descriptive traits of the linear classification first-born cows of dairy breeds was carried out in the herd of private enterprise "Buryns'ke" Pidlisnivsky branch of Sumy region for breeding Ukrainian Black-and-White dairy and Holstein breeds. The udder was evaluated in two ways - metric and visual using the linear classification method. Due to the selection importance of determining the correlation variability between measurements and udder linear traits of cows, we set a goal to determine their level in a comparative analysis of two specialized dairy breeds. The highest positive and reliable correlations have been obtained between udder measurements, which were in first-born cows of Ukrainian Black-and-White dairy and Holstein breeds, between udder girth and fore quarter depth (r = 0.466 and 0.474), fore quarter length (r = 0.325 and 0.366) and especially with the length (r=0.632 and 0.654) and width (r=0.584 and 0.522) of the udder. A slightly smaller, but also positive correlation was determined with the distance between fore (r=0.268) and rear (r=0.253) teats. Anatomically related udder parts were correlated with high levels of coefficients and their reliability - fore teats length with rear ones (r = 0.698 and 0.713), fore teats diameter with rear ones (r = 0.661 and 0.578), and the distance between of fore and rear (0.569 and 0.269) teats. Reliable positive correlations between the descriptive traits of linear classification were obtained between traits that responsible for udder attachment at the appropriate height. The fore udder attachment of Ukrainian Black-and-White dairy and Holstein cows correlated with rear attachment height (r = 0.324 and 0.458), central ligament (r = 0.353 and 0.386), and udder depth (r = 0.255 and 0.384). The rear udder attachment was similarly correlated with the central ligament (r = 0.411 and 0.381) and udder depth (r = 0.339 and 0.378), and central ligament with udder depth (r = 0.369 and 0.258), respectively. The positive level of phenotypic correlations established between individual udder measurements and descriptive linear type traits, especially between anatomically and functionally related ones, testified about their indirect development in the direction of dairy cows desired type.
References
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