Effects of age and photoperiod on the responsiveness of the pituitary gland of the vole (Microtus agrestis) to stimulation by GnRH

in Reproduction
Authors:
R. F. T. Kinch
Search for other papers by R. F. T. Kinch in
Current site
Google Scholar
PubMed Close
,
R. P. Craven
Search for other papers by R. P. Craven in
Current site
Google Scholar
PubMed Close
, and
B. K. Follett
Search for other papers by B. K. Follett in
Current site
Google Scholar
PubMed Close
DOI:
https://doi.org/10.1530/jrf.0.0760075
Volume/Issue:
Volume 76: Issue 1
Page Range:
75–82
Article Type:
Research Article
Online Publication Date:
Jan 1986
Free access

Sign up for journal news

Summary. Male voles were raised from birth to 100 days of age in photoperiods of 16L:8D or 6L:18D. In the long photoperiod testes increased in size between 15 and 80 days of age, and there was an increase in seminal vesicle weight from 60 days of age. Spermatozoa were present in the testes at 60 days of age. In the short photoperiod testicular growth did not begin until 50 days of age with the seminal vesicles beginning to increase at 80 days of age. Spermatozoa were present in the testes at 100 days of age. Pituitary secretion in vitro of LH and FSH in response to 1 pmol GnRH, as well as hypothalamic GnRH content, rose to peaks at 50 and 80 days of age respectively in animals exposed to long photoperiods. There was no change in pituitary secretion of FSH in response to GnRH stimulation in animals from the short photoperiod. However, pituitary release of LH in response to 1 pmol GnRH rose to a peak at 80 days of age. Hypothalamic GnRH content rose to a peak at 50 days of age and then declined. The relationship between the hypothalamic GnRH and the sensitivity of the pituitary to GnRH stimulation is compatible with the idea that GnRH can mediate its own receptor numbers.

Reproduction is committed to supporting researchers in demonstrating the impact of their articles published in the journal.

The two types of article metrics we measure are (i) more traditional full-text views and pdf downloads, and (ii) Altmetric data, which shows the wider impact of articles in a range of non-traditional sources, such as social media.

More information is on the Reasons to publish page.

Sept 2018 onwards Past Year Past 30 Days
Full Text Views 199 86 15
PDF Downloads 59 13 4

 

  • Collapse
  • Expand
Print ISSN:
1470-1626
Online ISSN:
1741-7899