The dynamics of the main measurements of bulls-sires black-and-white breed

Of great importance in breeding is the evaluation of bulls-sires by their own productivity and the productivity of their daughters. In the scientific work, the dynamics of changes in the magnitude of the main measurements in bulls-sires of Black-and-White breed from 12 months to 5 years is studied. It has been established that for bulls-producers, different tendencies of an increase in individual measurements may appear. So, an increase in height at the withers of the bull-sire of Laser 77 took place according to a relationship that can be expressed by the equation y = 7.7143x + 118 with a confidence value of R2 = 0.99 (where x = 1 for 12 months, 2 for 18 months, 3 - for 2 years, etc.). An increase in the height at the withers of the Chord bull-sire 1029 occurred according to the dependence, which can be expressed by the polynomial graph y = 0.3929x2 + 2.7643x + 122.6 with a confidence value of R2 = 0.97. In the manufacturing bull-sire of Laser 77, the majority of measurements increased linearly, while in other bulls-sires, both linear and non-linear trends could be manifested in measurements. This should be paid attention to when breeding them. Thus, each bulls-sires manufacturer has its own characteristics individual development.