Plasma levels of androstenedione, epitestosterone, testosterone and oestrogens in cows at parturition.
The concentration of total unconjugated oestrogens in the peripheral plasma of cows increased from 2.00 +/- 0.20 (S.E.M.) ng/ml 7 days before to 3.87 +/- 0.50 ng/ml 1 day before parturition and declined to values below 0.30 ng/ml on day 2 post partum. The concentrations of androstenedione, epitestosterone and testosterone remained approximately constant at 0.90 +/- 0.10, 0.92 +/- 0.08 and 0.40 +/- 0.20 ng/ml respectively during the last week of pregnancy. After parturition the concentration of the three androgens declined rapidly. Similar to data obtained in goats we did not find a marked increase in androgen levels in the peripheral blood of cows before parturition.
D000735:Androstenedione / Q000097:blood*; D000818:Animals; D002417:Cattle / Q000097:blood*; D004845:Epitestosterone / Q000097:blood*; D004967:Estrogens / Q000097:blood*; D005260:Female; D007743:Labor, Obstetric; D011247:Pregnancy; D013739:Testosterone / Q000097:blood*
D004967:Estrogens; D013739:Testosterone; D000735:Androstenedione; D004845:Epitestosterone