Abstract
Mated female rabbits were injected subcutaneously on Days 5 to 7 or 7 to 9 of pregnancy with various substances in nut oil, and examined on Days 9 to 11. Approximately 50% failure of normal implantation was caused by 30 [mu]g of oestradiol, 25 mg of dimethylstilboestrol or 10 mg of 17-ethinyl-19-nortestosterone daily. MER 25 in doses of up to 25 mg, and 17-ethyl-19-nortestosterone in doses of up to 10 mg daily were ineffective.

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