RETRACTED: The effect of different variants of pig introductory crossing on the variability of blood protein metabolismNatal`ya Garskaya, Sergey Tresnitskiy, Andrey Rudenko, Anastasiya Kochetkova and Alexey SavenkovBIO Web Conf., 138 (2024) 01021DOI: https://doi.org/10.1051/bioconf/202413801021