For citations:
Tsis E.Yu., Duborezov V.M., Rykov R.A. Productivity and blood biochemical profile of first-calf heifers at increasing feed levels. IZVESTIYA OF TIMIRYAZEV AGRICULTURAL ACADEMY. 2024;1(3):135-145. (In Russ.) https://doi.org/10.26897/0021-342X-2024-3-135-145