@article{Tsvigun_Tsvigun_1, title={THE PRODUCTIVITY OF COWS AND AVAILABILITY OF MICROELEMENTS AT DIFFERENT LEVELS OF DRY SUBSTANCE AND PROTEIN IN THE RATION}, volume={4}, url={https://bulletin-biosafety.com/index.php/journal/article/view/140}, number={1}, journal={Theoretical and Applied Veterinary Medicine}, author={Tsvigun, A. and Tsvigun, O.}, year={1}, month={1}, pages={279-283} }