FIELD: feed production. SUBSTANCE: invention relates to using amorphous silica as feed additive for ruminants and, in particular, utilizing opokas from Sverdlovsk region deposits containing amorphous silica at the level of at least 50% in the form of flour, which is fed to animal in daily amount of 10 to 200 g mixed with concentrated feed. Such mixture is prepared from crude opoka with particle size 2 to 7 mm. EFFECT: increased weight of new-born animals and their weight growth over the first postnatal month. 4 cl, 7 tbl
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