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- Title
Lamprey GnRH-III Stimulates FSH Secretion in Barrows.
- Authors
Kauffold, J.; Schneider, F.; Zaremba, W.; Brüssow, K.-P.
- Abstract
Contents Although studies have indicated that follicle-stimulating hormone (FSH) and luteinizing hormone (LH) release can be dissociated in the pig, the underlying mechanisms are still to be answered. Since it was demonstrated that lamprey gonadotropin-releasing hormone (l-GnRH-III) has preferential FSH-releasing potency in several mammalian species, we have investigated the gonadotropin-releasing activity of l-GnRH-III in barrows. Each of nine barrows (body weight: 85–90 kg; age: 207 days) received 2 ml saline (S-barrow), followed by 150 μg l-GnRH-III (1.6–1.7 μg/kg body weight) dissolved in 2 ml saline intramuscularly 7 days later. Three pre-treatment and 13 post-treatment blood samples were taken at intervals of 30 min to 8 h to assess basal and treatment-associated concentrations of FSH and LH, respectively, by radioimmunoassay. Animals were defined as having responded to treatment if, 2 h post-treatment, plasma FSH and/or LH levels were >3 SD of the respective basal concentrations. There was no treatment-associated FSH response after saline treatment, but a clear FSH response in all l-GnRH-III-injected barrows. On average, the maximum FSH level (205% of the basal concentration) was observed at 1 h post-treatment. Mean FSH values were elevated until 10 h post-treatment. There was no LH response either to saline or to l-GnRH-III. In conclusion, this study demonstrates a selective FSH-releasing activity of 150 μg l-GnRH-III in barrows. Further studies are needed to investigate whether this effect is ubiquitous in the pig and what the physiological relevance is.
- Subjects
SWINE; LIVESTOCK reproduction; GONADOTROPIN releasing hormone; LAMPREYS; GONADOTROPIN; RADIOIMMUNOASSAY
- Publication
Reproduction in Domestic Animals, 2005, Vol 40, Issue 5, p475
- ISSN
0936-6768
- Publication type
Article
- DOI
10.1111/j.1439-0531.2005.00609.x