Comparative assessment of the timing of sexual maturation in male Wistar Han and Sprague-Dawley rats

Sarah N. Campion, Francisco R Carvallo chaigneau, Robert E. Chapin, William S. Nowland, David Beauchamp, Raul Jamon, Rebecca Koitz, Timothy R. Winton, Gregg D. Cappon, Mark E. Hurtt

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


Given the increasing use of Wistar Han (WH) rats in regulatory toxicology studies, these studies were performed to characterize the onset of sexual maturation in maturing WH rats as compared to Sprague-Dawley (SD) rats. Beginning on postnatal day (PND) 38 through PND 91 groups (n=8) of untreated WH rats were evaluated for maturation of the male reproductive system. Testicular spermatid head counts increased beginning on PND 42 until PND 70. Sperm were detected in the caput, corpus, and cauda epididymis on PND 45, 49, and 49, respectively, and counts increased through PND 91. Sperm motility was at adult levels by PND 63. The morphology of the testis/epididymis of all animals at day 70 or older was consistent with qualitative sexual maturity. Based on these endpoints, WH rats were determined to be sexually mature at PND 70, and many of these endpoints evaluated in SD rats exhibited nearly identical trends.

Original languageEnglish (US)
Pages (from-to)16-24
Number of pages9
JournalReproductive Toxicology
StatePublished - Jul 2013
Externally publishedYes


  • Epididymis
  • Male reproductive system
  • Sexual maturation
  • Sperm
  • Sprague-Dawley
  • Testis
  • Wistar Han

ASJC Scopus subject areas

  • Toxicology


Dive into the research topics of 'Comparative assessment of the timing of sexual maturation in male Wistar Han and Sprague-Dawley rats'. Together they form a unique fingerprint.

Cite this