FIELD: veterinary, zootechny. SUBSTANCE: origin raw materials are crushed, washed and degased if it is necessary. Then decalcification, alkali-salt treatment, salt washing, neutralization, washing by running water, dissolving in organic acid, dialysis and additional dissolving are carried out. At some of mentioned above stages ultrasound treatment takes place to promote technological processes. EFFECT: improves efficiency of the method. 5 cl, 3 tbl
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