Abstract
The results of the influence of different dosages of organoselenium preparations on the blood biochemical parameters of replacement heifers in different age periods are presented. It was found that the inclusion of organic selenium preparations Sel-Plex and DAFS-25 in the diet of replacement heifers up to 18 months of age at the rate of selenium 0.20–0.36 mg / kg of dry matter of the diet contributed to an increase in protein metabolism.
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