THE TEMPORAL RELATIONSHIP BETWEEN GONADOTROPIN RELEASING HORMONE (GnRH) AND LUTEINIZING HORMONE (LH) SECRETION IN OVARIECTOMIZED EWES1

Endocrinology ◽  
1982 ◽  
Vol 111 (5) ◽  
pp. 1737-1739 ◽  
Author(s):  
IAIN J. CLARKE ◽  
JAMES T. CUMMINS
Keyword(s):  
Luteinizing Hormone ◽  
Temporal Relationship ◽  
Gonadotropin Releasing Hormone ◽  
Releasing Hormone ◽  
Lh Secretion

scholarly journals Induction of final oocyte maturation in Cyprinidae fish by hypothalamic factors: a review

2009 ◽  
Vol 54 (No. 3) ◽  
pp. 97-110 ◽  
Author(s):  
P. Podhorec ◽  
J. Kouril
Keyword(s):  
Luteinizing Hormone ◽  
Oocyte Maturation ◽  
Hormone Secretion ◽  
Inhibitory Effect ◽  
Gonadotropin Releasing Hormone ◽  
Luteinizing Hormone Secretion ◽  
Releasing Hormone ◽  
Final Oocyte Maturation ◽  
In Captivity ◽  
Lh Secretion

Gonadotropin-releasing hormone in Cyprinidae as in other Vertebrates functions as a brain signal which stimulates the secretion of luteinizing hormone from the pituitary gland. Two forms of gonadotropin-releasing hormone have been identified in cyprinids, chicken gonadotropin-releasing hormone II and salmon gonadotropin-releasing hormone. Hypohysiotropic functions are fulfilled mainly by salmon gonadotropin-releasing hormone. The only known factor having an inhibitory effect on LH secretion in the family Cyprinidae is dopamine. Most cyprinids reared under controlled conditions exhibit signs of reproductive dysfunction, which is manifested in the failure to undergo final oocyte maturation and ovulation. In captivity a disruption of endogenous gonadotropin-releasing hormone stimulation occurs and sequentially that of luteinizing hormone, which is indispensible for the final phases of gametogenesis. In addition to methods based on the application of exogenous gonadotropins, the usage of a method functioning on the basis of hypothalamic control of final oocyte maturation and ovulation has become popular recently. The replacement of natural gonadotropin-releasing hormones with chemically synthesized gonadotropin-releasing hormone analogues characterized by amino acid substitutions at positions sensitive to enzymatic degradation has resulted in a centuple increase in the effectiveness of luteinizing hormone secretion induction. Combining gonadotropin-releasing hormone analogues with Dopamine inhibitory factors have made it possible to develop an extremely effective agent, which is necessary for the successful artificial reproduction of cyprinids.

Dual intracellular pathways in gonadotropin releasing hormone (GnRH) induced desensitization of luteinizing hormone (LH) secretion

Life Sciences ◽  
1999 ◽  
Vol 64 (24) ◽  
pp. 2215-2223 ◽  
Author(s):  
M.Patricia Cassina ◽  
Lois C. Musgrove ◽  
L.Wayne Duck ◽  
Jeffrey C. Sellers ◽  
Jimmy D. Neill
Keyword(s):  
Luteinizing Hormone ◽  
Gonadotropin Releasing Hormone ◽  
Releasing Hormone ◽  
Intracellular Pathways ◽  
Lh Secretion

NALOXONE ELEVATES PLASMA FOLLICLE STIMULATING HORMONE BUT NOT LUTEINIZING HORMONE LEVELS IN THE IMMATURE MALE PIG

1989 ◽  
Vol 69 (4) ◽  
pp. 1095-1098 ◽  
Author(s):  
V. TRUDEAU ◽  
A. PHARAZYN ◽  
F. X. AHERNE ◽  
E. BELTRANENA
Keyword(s):  
Luteinizing Hormone ◽  
Plasma Levels ◽  
Intraperitoneal Injection ◽  
Follicle Stimulating Hormone ◽  
Gonadotropin Releasing Hormone ◽  
Endogenous Opiates ◽  
Releasing Hormone ◽  
Immature Male ◽  
Lh Secretion ◽  
Stimulating Hormone

The effects of intraperitoneal injection of gonadotropin-releasing hormone (GnRH) alone, naloxone (NAL) alone, or in combination on plasma levels of follicle stimulating hormone (FSH) and luteinizing hormone (LH) was studied in 4- to 5-wk-old male pigs. GnRH (1 μg kg−1) effectively stimulated (P < 0.05) secretion of both gonadotropins whereas NAL (1 and 10 mg kg−1) stimulated only FSH secretion (P < 0.05). There was no interaction between GnRH and NAL on gonadotropin release. These results suggest that endogenous opiates are involved in the regulation of FSH secretion but not LH secretion in the immature male pig. Key words: Follicle-stimulating hormone, luteinizing hormone, naloxone, gonadotropin-releasing hormone, male pig

0468 The repeatability of gonadotropin releasing hormone-induced release of luteinizing hormone and its association with fertility in dairy cattle

2016 ◽  
Vol 94 (suppl_5) ◽  
pp. 223-224
Author(s):  
M. Gobikrushanth ◽  
P. A. Dutra ◽  
C. A. Felton ◽  
T. C. Bruinjé ◽  
M. G. Colazo ◽  
...  
Keyword(s):  
Luteinizing Hormone ◽  
Dairy Cattle ◽  
Gonadotropin Releasing Hormone ◽  
Releasing Hormone
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