[Attempt to stimulate labor in cows and heifers]

Attempts were made to induce delivery in 79 cows and 20 heifers, using the preparations dexametasone, cloprostenol, and dinolytic. The level of progesterone and estradiol was determined in four cows. A group of 20 heifers were injected with the preparation fortecortin at the rate of 30 mg. Four cows with induced parturition were used to evaluate the changes setting in with the blood level of estradiol 17 beta and progesterone. The following conclusions were made: 1. Best effects with regard to the indices duration of calving parturition and post-partal complications, and independence and service period are produced with the combined application of 50 mg sodium selenite and 680 UI vitamin E with 30 mg dexametasone. 2. The decrease in liveweight of the newborn calves from heifers at an average of 6 kg leads to the prevention of dystocia and the shortening of the post-partal period.