Morphological qualities of the udder of cross-bred black-and-white heifers

Abstract

There are quite a lot of studies on the influence of the father's genotype on the productivity of offspring. The initial goal of our research was to determine the influence of the maternal side, as well as the influence of various linear combinations of parents on the productivity of offspring. Our studies of the morphological qualities of the udder of first-calf cows of different cross lines, as well as pure line cows, revealed very significant differences between the experimental groups. Thus, the best udder development was achieved by cows of the cross lines Vis Back Ideal with Siling Trajun Rokit, as well as cows of the pure line Reflection Sovering. It is characteristic that the "mirror" cross Siling Trijun Rockit with Vis Back Ideal had indicators of udder development slightly worse. Therefore, we can conclude that in JSC "Zarya" the greatest influence on the development of the morphological qualities of the udder is exerted by the paternal side, namely, the selection of the bull-producer. At the same time, the use of bulls-producers of the Vis Back Ideal line in this herd negatively affects the development of the udder of cows after the first lactation. The indicators of the udder size before milking in the groups of cows with the paternal side of the Vis Back Ideal are 868.2-1248.9 cm2 lower than in their peers.