Relationship Between Luteinizing Hormone Releasing Hormone Concentration in Hypophysial Portal Blood and Luteinizing Hormone Release in Intact, Castrated, and Electrochemically-Stimulated Rats1 ROBERT L. ESKAY,2 RENON S. MICAL, AND JOHN C. PORTER Cecil H. and Ida Green Center for Re))roductive Biology Sciences, Department of Obstetrics and Gynecology and Department of Physiology, The University of Texas Health Science Center at Dallas, Southwestern Medical School, Dallas, Texas 75235 60, 60 to 90, 90 to 120, and 120 to 150-min periods after electrochemical stimulation of the MPOA were 105 ± 24.2, 61 ± 10.8, 51 ± 8.2, 36 ± 5.3, and 32 ±4.1 pg/ml, respectively. LHRH levels in portal plasma from the unstimulated lats were not detectable (
