FIELD: cattle breeding.SUBSTANCE: invention relates to fodder biologically active additives. Biologically active feed additive for animals and birds contains the following components, wt. %: powder of diatomite fine-dispersed fraction 0–100 microns – 70–80, powder of aluminosilicate dry fine–grained fraction 0–100 microns – 5–15, bacteria Bacillus subtilis – 0.5–1 and Bacillus licheniformis – 0.5–1, yeast Saccharomyces cerevisiae – 5–15, powder of milk thistle – 0.5–1.5, citric acid – 0.5–1.5 and succinic acid – 0.5–1.5. Method for manufacturing a biologically active feed additive for animals and birds is that the diatomite is ground in a single-shaft clay-loosener with simultaneous drying at 450 °C to fine powder of fraction 0–100 microns. After that the diatomite fine powder and dry fine-porous aluminosilicate powder are mixed. Then bacteria and yeast are applied to the resulting mixture. Further, the citric and succinic acids are mixed with the milk powder and the
