Jun 26, 1985 - at Amarillo,. Amaril- lo, TX 79106. BIOLOGY. OF REPRODUCTION. 33, 1078-1083. (1985). 1078. Serum Androstenedione and Testosterone.
BIOLOGY
OF REPRODUCTION
33, 1078-1083
(1985)
Serum Androstenedione and Testosterone Concentrations during Pregnancy and Nonpregnant Cycles In Dogs1 PATRICK
W. CONCANNON2’4
York
New
and
V. DANIEL
CASTRACANE3’5
Department of Physiology4 State College of Veterinary Cornell Ithaca,
Medicine
University
York
New
14853
and Department Southwest
of Clinical Sciences Foundation for San
and Reproductive Biology5 Research and Eduction
Antonio,
Texas
ABSTRACT
Concentrations
of testosterone and of androstenedione were determined by radioimmunoassay in serum samples collected every 2-5 days throughout the periovulatory and luteal phases of the ovarian cycles of pregnant and nonpregnant beagle bitches. Testosterone levels were consistently lower than those of androstenedione, reached peaks of 29 ± 4 ng/dl near the time of the preovulatory lutemnizing hormone peak, and were reduced to near the limits of detection (5-10 ng/dl) throughout the luteal phase. Androstenedione levels reached preovulatory peaks of 73 ± 13 ng/dl, were 54 ± 7 ng/ml during early estrus, increased (P0.05). At parturition androstenedione levels fell (P
