Comparative assessment of cows by daughters from different breeding bulls in terms of milk production

Abstract

Abstract The increase in the productivity of cows is inseparably linked with the intensification of selection work with dairy cattle. All over the world, dairy cattle are used to obtain milk, including such related ones as black-and-white, Holstein, Dutch, which differ in economically useful qualities depending on the climatic and ecological-forage conditions of the breeding zone, and the gene pool of breed resources. Animal perfection is achieved by selecting the best males and females for reproduction and individual selection. The transmission of genes from generation to generation is carried out from father to son, from mother to son, from father to daughter, from mother to daughter. The rate of genetic improvement in dairy cattle populations depends on the efficiency of the assessment, selection and use of these groups of animals. Currently, the farm uses the daughters of sire bulls belonging to 3 Holstein lines. Several breeding bulls are used in each line. So, at present, the farm uses 17 bulls-sires of the Vis Back Aydial 1013415 line, 10 bulls of the Reflection Sovering 198998 line and 3 bulls of the Montvik Chief 95679 line, but the daughters of not all breeding bulls are already used in the herd. The belonging of cows to a certain line reliably at a high level of reliability influences the indicators of milk productivity. The decrease in milk yield in cows of the Montvik Chieftain 95679 line is accompanied by an improvement in the quality indicators of milk, namely, MJ in milk. Daughters of bulls-producers of a certain line differ in their productive qualities. The best indicators were found in the groups of daughters of sire bulls: Emen 105018721 and Pilot 63811814 (Reflection Sovering line 198998); Reverse 2708 (Montvik Chieftain line 95679); Tek 69052876 and Fennek 4241542328 (Vis Back Aydial line 1013415).