Correlation of maternal concentrations of plasma testosterone with fetal sex in horses

ABSTRACT: The objectives of this study were to evaluate the correlation fetal sex and plasma testosterone concentrations between 5th 8th months pregnancy in mares verify applicability test predict sex. Blood samples collected from 21 at 30-day intervals 150 240 days pregnancy. Plasma was determined by radioimmunoassay foals confirmed birth. levels maternal higher carrying female fetuses 5 8 (P < 0.05). Limit values analyzing receiver operating characteristic (ROC) estimates: 35.5 pg/mL 40 for month, respectively. For with equal or above threshold, gestation predicted, those below threshold male predicted. In predictive 70% 88.9%, respectively; detection rates 87.5% 72.7%, total accuracy examination 78.9%. 80% 90%, 88.9% 81.8%, 85%. It concluded that there a pregnant mares. Prediction based on can be performed 78.9% 85% accuracy,