THE EFFECT OF SELECTION ON DAIRY PRODUCTIVITY AND PROPERTIES OF COW UDDERS

Abstract

Studies conducted on the compatibility of lines in the herd of black-and-white cattle of the Volzhniigim agricultural Enterprise of the Saratov region showed that with in-line selection, cows from the Hiltjes Adema line had the highest milk yields, however, animals of this group are characterized by the lowest fat content in milk, inferior to their peers from the Annas Adema and Rutjes Eduard lines by 0.06-0.1%. In the Hiltjes Adem line, cows whose mothers belonged to the Lindbergh and Nordstein line had the lowest milk yields (3781 and 3476 kg). Cows from the Hiltjes Adema line from in-line breeding were less fat-dairy and were inferior to the other groups by 0.1-0.15%. Daily milk yield is used in connection with the characteristic of the rate of milk production, it is known that there is a positive correlation between these two signs. According to our data, the correlation coefficient between daily milk yield and milk production rate is + 0.29-0.48.