The aim of the research was to examine indices of protein metabolism, concentration of ferrum and copper in tissues of suckling piglets when lactating sows are fed with soy okara. It is proved that the use of soy okara as a feeding increases the intensity of biosynthesis of tissue proteins in the body of suckling piglets. At the same time there is decrease in the transport and oxidation of trivalent ferrum and increase in the mobilization of bivalent ferrum through the copper transport system.