Influence of Using Various Levels of Protein Concentrate in Rations of Ayrshire Dairy Cows on Rumen Microbiome, Reproductive Traits and Economic Efficiency by Nikolai P. Buryakov, Dmitrii E. Aleshin, Maria A. Buryakova, Anastasya S. Zaikina, Georgy Y. Laptev, Larisa A. Ilina, Aleksandr S. Petrov, Nikolay M. Kostomakhin, Ahmed I. El Sheikh, Ferial M. Sahwan, Mohamed M. Fathala

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