Some Effects of Estrogen Injections on the Estrual Cycle of Gilts

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Abstract
An experiment has been conducted on 10 gilts which were given intramuscular injections of 3 mg. of diethylstilbestrol in corn oil on either the 6th, 11th, or 16th day of the estrual cycle. Injections on the 11th day were observed to lengthen the estrual cycle significantly, (apparently due to luteinization of follicles), while injections on the 16th day were variable in effect but most frequently caused a significant shortening of the cycle. Injections given on the 6th day of the cycle had no apparent effect. The average lengths of the completed cycles were 19.78, 25.60 and 17.75 days for those in which the injection was made on the 6th, 11th or 16th day, respectively. The corresponding recovery cycles were 19.00, 19.67 and 19.86 days.

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