FIELD: animal science. SUBSTANCE: the suggested method deals with supplementing cows' diet with fodder additive out of sawwort (Serratula coronata) at content of 20- hydroxyecdizone being 0.8-1.7 weight%, at the quantity of 5 g/animal. Fodder additive is applied in case of ovarian functional rest in cows in puerperal period during any 10 d, and at decreased ovarian functional activity - daily since the 10th d of estral cycle for 10 d or since the 1st d of heat for 5 d. The method stimulates return of valuable estral cycles and heats in puerperal period and increases ability for fertilization in cows. EFFECT: higher efficiency of regulation. 2 cl, 3 ex, 3 tbl
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