Dynamics of correlation coefficients of economic and productive characteristics depending on the age of cows

In 2002, a new Ural type of black-and-white breed was officially registered. Animals this have high productivity indicators, but at the same time there is decrease in productive longevity breeding stock. The conjugacy milk yield for lactation established, which allows first to carry out selection fory yield. relationship weakens with age animals and becomes negative fifth lactation. such characteristics as per fat mass fraction varies both by relative between protein fluctuations from low medium-negative. For 5 lactation, positive There are correlation coefficients lactations, conjugation trait each other remains period 4 excluding coefficient indicator 1