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Pubertal development in the male pig: effects of treatment with a long-acting gonadotropin-releasing hormone agonist on plasma luteinizing hormone, follicle stimulating hormone and testosterone.
Can J Vet Res. 1992 Apr; 56(2):102-9.CJ

Abstract

The effects of a long-acting gonadotropin-releasing hormone (GnRH) agonist, [D-Trp6]-GnRH (GnRH-A) on developmental profiles of plasma luteinizing hormone (LH), follicle stimulation hormone (FSH) and testosterone (T), and pituitary responsiveness to exogenous GnRH were studied in male Dutch Landrace x Large White crossbred pigs from 1 to 30 wk of age. Group 1 control animals (control; n = 12) were injected subcutaneously in the neck with vehicle at 1 and 16 wk of age. Group 2 animals (early treatment; n = 10) were injected with 600 micrograms [D-Trp6]-GnRH at 1 wk and with vehicle at 16 wk. Group 3 animals (late treatment; n = 8) were injected with vehicle and 3 mg GnRH-A at 1 and 16 wk, respectively. Group 4 animals (early plus late treatment; n = 9) were injected at both 1 and 16 wk with GnRH-A. Blood was collected by brachiocephalic puncture at weekly or biweekly intervals, and through brachiocephalic cannulae, to determine longitudinal profiles of LH, FSH and T, and plasma gonadotropin responses to intravenous injection of GnRH (0.1 microgram/kg), respectively. In control animals, LH and FSH declined over the first 5 wk of postnatal life and peaked again at 10-14 wk. Levels of both hormones were basal from 18 to 30 wk. Plasma T was high in the first week, declined progressively over the next few weeks and remained low until 24 wk when a transient increment was noted. The LH and FSH responses to acute GnRH stimulation were similar at 7 and 14 wk and declined significantly at 23 wk of age.(ABSTRACT TRUNCATED AT 250 WORDS)

Authors+Show Affiliations

Department of Functional Morphology, Veterinary Faculty, University of Utrecht, The Netherlands.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

1534270

Citation

Trudeau, V L., et al. "Pubertal Development in the Male Pig: Effects of Treatment With a Long-acting Gonadotropin-releasing Hormone Agonist On Plasma Luteinizing Hormone, Follicle Stimulating Hormone and Testosterone." Canadian Journal of Veterinary Research = Revue Canadienne De Recherche Veterinaire, vol. 56, no. 2, 1992, pp. 102-9.
Trudeau VL, Meijer JC, Erkens JH, et al. Pubertal development in the male pig: effects of treatment with a long-acting gonadotropin-releasing hormone agonist on plasma luteinizing hormone, follicle stimulating hormone and testosterone. Can J Vet Res. 1992;56(2):102-9.
Trudeau, V. L., Meijer, J. C., Erkens, J. H., van de Wiel, D. F., & Wensing, C. J. (1992). Pubertal development in the male pig: effects of treatment with a long-acting gonadotropin-releasing hormone agonist on plasma luteinizing hormone, follicle stimulating hormone and testosterone. Canadian Journal of Veterinary Research = Revue Canadienne De Recherche Veterinaire, 56(2), 102-9.
Trudeau VL, et al. Pubertal Development in the Male Pig: Effects of Treatment With a Long-acting Gonadotropin-releasing Hormone Agonist On Plasma Luteinizing Hormone, Follicle Stimulating Hormone and Testosterone. Can J Vet Res. 1992;56(2):102-9. PubMed PMID: 1534270.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Pubertal development in the male pig: effects of treatment with a long-acting gonadotropin-releasing hormone agonist on plasma luteinizing hormone, follicle stimulating hormone and testosterone. AU - Trudeau,V L, AU - Meijer,J C, AU - Erkens,J H, AU - van de Wiel,D F, AU - Wensing,C J, PY - 1992/4/1/pubmed PY - 1992/4/1/medline PY - 1992/4/1/entrez SP - 102 EP - 9 JF - Canadian journal of veterinary research = Revue canadienne de recherche veterinaire JO - Can J Vet Res VL - 56 IS - 2 N2 - The effects of a long-acting gonadotropin-releasing hormone (GnRH) agonist, [D-Trp6]-GnRH (GnRH-A) on developmental profiles of plasma luteinizing hormone (LH), follicle stimulation hormone (FSH) and testosterone (T), and pituitary responsiveness to exogenous GnRH were studied in male Dutch Landrace x Large White crossbred pigs from 1 to 30 wk of age. Group 1 control animals (control; n = 12) were injected subcutaneously in the neck with vehicle at 1 and 16 wk of age. Group 2 animals (early treatment; n = 10) were injected with 600 micrograms [D-Trp6]-GnRH at 1 wk and with vehicle at 16 wk. Group 3 animals (late treatment; n = 8) were injected with vehicle and 3 mg GnRH-A at 1 and 16 wk, respectively. Group 4 animals (early plus late treatment; n = 9) were injected at both 1 and 16 wk with GnRH-A. Blood was collected by brachiocephalic puncture at weekly or biweekly intervals, and through brachiocephalic cannulae, to determine longitudinal profiles of LH, FSH and T, and plasma gonadotropin responses to intravenous injection of GnRH (0.1 microgram/kg), respectively. In control animals, LH and FSH declined over the first 5 wk of postnatal life and peaked again at 10-14 wk. Levels of both hormones were basal from 18 to 30 wk. Plasma T was high in the first week, declined progressively over the next few weeks and remained low until 24 wk when a transient increment was noted. The LH and FSH responses to acute GnRH stimulation were similar at 7 and 14 wk and declined significantly at 23 wk of age.(ABSTRACT TRUNCATED AT 250 WORDS) SN - 0830-9000 UR - https://www.unboundmedicine.com/medline/citation/1534270/Pubertal_development_in_the_male_pig:_effects_of_treatment_with_a_long_acting_gonadotropin_releasing_hormone_agonist_on_plasma_luteinizing_hormone_follicle_stimulating_hormone_and_testosterone_ L2 - https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/1534270/ DB - PRIME DP - Unbound Medicine ER -