[Influence of the biological activity of substances on the puerperal period and fertility of cows].

Experiments were carried out to shorten the service period and increase the conception rate in 304 cows under productional conditions with the use of drugs, hormonal means, and preparations producing unspecific effects on the reticulo-endothelial system, immediately after giving birth. It was found that: the parenteral treatment of cows one to three hours following calving with 200,000 IU vitestrol and 15-20 IU hypophysin, on the one hand, and (after the removal of the placenta) the infusion into the uterus of 1-2 g chloramphenicol, 15 g ac. citricum of Na citricum and 0.2 g pilocarpinum hydrochloricum, emulsified in 20-30 cu. cm oil emulsion of vitamins A, D3 and E, and the injection by the fifth day after calving of 30-40 cu. cm of tissue emulsion prepared after Filatov with the use of bovine liver or swine embryos, on the other, decreased the "independences" period with 7.01 days, the service period -- with 27.50 days, and the index of insemination -- with 0.60. At the same time the conception rate resulting from the first insemination rose by 25.20 per cent as compared to the untreated animals. The prophylactic veterinary treatment of cows thus contributed in decreasing the cases of retentio secundinarum after calving by 6.2 per cent, and the cases of acute endometritis -- by 12.9 per cent. Treatment of cows after calving, using hormonal, chemiotherapeutic, and biogenic stimulators, contributes, along with other means to raise the annual number of calves per 100 cows up to ten.