Cited by 219Sperm and Testicular FunctionHypothalamic control of reproductive hormonesHormonal and reproductive studies

Variations in serum FSH, LH and testosterone levels in male rats from birth to sexual maturity

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LEE, V. W. K., DE KRETSER, D. M., HUDSON, B., WANG, C.·1975·Reproduction

Abstract

Summary.: Serum LH, FSH and testosterone concentrations were measured by radioimmunoassays in male Sprague-Dawley rats from birth to 80 days of age. The levels of FSH were significantly elevated during the first 5 days of postnatal life. An abrupt decline in FSH concentrations occurred during this period, from levels of 800 ng/ml on Day 1 to levels of 300 ng/ml on Day 6. Subsequently, FSH levels fluctuated widely until about Days 30 to 45, when a secondary peak of FSH was observed. Thereafter, a decline in FSH levels to those found in adult rats occurred. This decline in FSH levels appears to coincide with the first release of mature spermatozoa from the germinal epithelium in the testis. During the first 30 days of postnatal life, LH and testosterone values appeared to be inversely related to each other and an LH peak and a nadir of testosterone levels was observed between Days 6 and 14 at a time corresponding to regression of the fetal generation of interstitial cells. A parallel rise in LH and testosterone levels occurred from Day 30 to sexual maturity and corresponded to the development of the adult generation of interstitial cells.

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Crossref · 10.1530/jrf.0.0420121

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  • Average testosterone levels in the adult groups fell within the range of typical adult male levels.

    “These levels fall within the range of typical adult male levels of circulating testosterone.33”

    From Neonatal MeCP2 is important for the organization of sex differences in vasopressin expression (2012) · cites this paper as [33]

    The ‘Serum LH and testosterone levels’ section reports circulating testosterone above 230 ng/100 ml in male rats at 70–80 days of age. It provides a reference value for sexually mature rats, but does not define a typical adult male range or report the citing document’s group averages, so the claimed comparison is not established by this paper alone. (LLM, conf=0.78)

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Authors
LEE, V. W. K., DE KRETSER, D. M., HUDSON, B., & WANG, C.
Affiliations
The University of Melbourne (AU)
Venue
Reproduction
Published
1975-01-01
Volume
42
Issue
1
Pages
121-126
ISSN
  • 1470-1626 (ISSN-L)
  • 1741-7899
OpenAlex
W2033259793
Cited by
219
References
7
Citations by year
2025: 1 · 2024: 2 · 2023: 2 · 2022: 7 · 2021: 8 · 2020: 5 · 2019: 7 · 2018: 3 · 2017: 3 · 2016: 3 · 2015: 5 · 2014: 7 · 2013: 7 · 2012: 7
FWCI
4.87
Type
journal article
Language
en
Open access
Locations
  • Reproduction (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Health and Medical Research Council
  • National Medical Research Council
Topics
  • Health Sciences › Medicine › Reproductive Medicine › Sperm and Testicular Function
  • Health Sciences › Medicine › Reproductive Medicine › Hypothalamic control of reproductive hormones
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Hormonal and reproductive studies
Keywords
luteinizing hormone, follicle-stimulating hormone, testosterone, postnatal development, male rats, sexual maturation, Leydig cell development, spermiation, interstitial cells, gonadotropins
MeSH terms
Age Factors, Animals, Antibodies, Follicle Stimulating Hormone, Iodine Radioisotopes, Luteinizing Hormone, Male, Radioimmunoassay, Spermatozoa, Testosterone, Rats

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