XORIJDAN KELTIRILGAN GERMANIYA SELEKSIYASIGA MANSUB GOLSHTIN ZOTLI SIGIRLARNING TURLI NASLLI BUQALAR AVLODI BO‘YICHA I LAKTATSIYADAGI SUT MAHSULDORLIGI VA XO‘JALIK UCHUN FOYDALI BELGILARINI BAHOLASH

This article presents the results of a comprehensive assessment of the milk productivity and economically beneficial traits of German-bred Holstein cows imported from abroad, broken down by offspring of breeding bulls of different lines during the first lactation period. The research was conducted between 2025 and 2026 at the «Tumaris Nur» farm in the Urgench district of the Khorezm region. For the study, 36 heads of first-born calves were selected, 12 heads each from German breeding bulls named Alfons, Jasper, and Geboren. Milk yields for 305 days of first lactation, milk fat content and protein content, fat and protein yield, 4% fat milk yield, live weight, and milk yield coefficient of the cows were studied. According to the research results, Jasper’s daughters produced 6089.6 kg of milk, which was 506.9 and 167.5 kg higher than those of Alfons and Geboren, respectively (P<0.05). High results were also recorded in the daughters of Jasper’s buffalo in terms of milk fat and protein yield, 4% milk, live weight, and milk yield. A high positive correlation was identified between milk quantity and fat and protein yield, 4% milk, and milk yield. The correlation coefficient for milk yield in mother-daughter pairs was 0.417; 0.639 and 0.185 respectively. The inheritance coefficient of milk yield based on mother-daughter regression was 0.294; 0.324 and 0.268 respectively. The highest heredity was noted in the daughters of the Jasper bull. The results obtained showed that the daughters obtained from Jasper bulls are promising from a breeding perspective in terms of milk productivity.

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