The results of crossing black-and-white cows with Holstein sires

At present, almost the entire population of the Black-and-White breed in Russia is absorbed by the Holstein breed. However, the scale of Black-and-White absorption has not yet been fully assessed. The populations of Black-and-White cattle of the Oryol region are no exception. The research was carried out at the Federal State Budgetary Scientific Institution «Federal scientific center of Legumes and Groats Crops» (Experimental station "Streletskaya") in order to study the results of crossing Black-and-White cows with Holstein sires in the conditions of the Oryol region. In a scientific work, it was determined that Holstein sires significantly influenced the structure of the dairy herd in terms of the percentage of Holstein genes. By 09.01.2022, according to the analysis, in the herd 1.3% were occupied by animals with a Holstein genes of 51-75%, 8.4% were cows with a Holstein genes of 76-87.5%, up to 41.9% of the dairy cattle were occupied by cows with Holstein genes of 87.6-93.75% for Holsteins. The rest of the animals had more than 15/16 Holstein genes (48% of the livestock). With an increase in the percentage of genes for the Holstein breed in the herd, an increase in milk yield over 305 days of the first lactation was observed from 5870 to 6279 kg of milk. The live weight of first-calf heifers increased from 503 to 520 kg (p function show_eabstract() { $('#eabstract1').hide(); $('#eabstract2').show(); $('#eabstract_expand').hide(); }