Dairy Productivity of Holstein Cows of Different Genetic Lines in the Conditions of Kostanay Region of Kazakhstan von Mussayeva, Gulzhan Kalenovna, Meldebekov, Alikhan Meldebekovich, Meldebekova, Nurgul Alikhanovna, Shaykamal, Gulshat Imanzhankyzy, Buralkhiyev, Batyrkhan Azimkhanovich, Rametov, Nurkuisa Mirzabekovich, Zhumanov, Kanat

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