Neonatal dihydrotestosterone and estrogen stimulation

Effects on sexual behavior of male rats

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Male rats castrated on the second day after birth (Day 2) were, for the next 10 days, given daily injections of one of five steroids or steroid combinations: 200 μg of testosterone propionate (TP); 200 μg of dihydrotestosterone propionate (DHTP); 5 μg of estradiol benzoate (EB); 5 μg of estradiol benzoate plus 200 μg of dihydrotestosterone propionate; oil vehicle (VH). Control male rats castrated on Day 90 received a sham castration and oil vehicle in the neonatal period. All animals were given TP in adulthood and tested for male sexual behavior. There was no difference in mounting activity among the subjects. Day 2 DHTP subjects displayed intromissions but were incapable of ejaculating. The more frequent display of intromissions by Day 2 DHTP animals in comparison to Day 2 VH animals could be solely due to their larger and more highly developed penes. On the other hand, the ejaculatory failure of the Day 2 DHTP subjects was attributed to some deficiency in central neural processes controlling ejaculatory mechanisms rather than inadequate penile development. Equivocal results were obtained with the Day 2 EB and Day 2 EB-DHTP animals in that only a few animals in both groups showed an ejaculatory pattern.

Original languageEnglish (US)
Pages (from-to)193-200
Number of pages8
JournalHormones and Behavior
Volume8
Issue number2
DOIs
StatePublished - Jan 1 1977

Fingerprint

Dihydrotestosterone
Sexual Behavior
Estrogens
Testosterone Propionate
Oils
Steroids
Castration
dihydrotestosterone propionate
Parturition
Injections
estradiol 3-benzoate

ASJC Scopus subject areas

  • Endocrinology
  • Endocrine and Autonomic Systems
  • Behavioral Neuroscience

Cite this

Neonatal dihydrotestosterone and estrogen stimulation : Effects on sexual behavior of male rats. / Hart, Benjamin.

In: Hormones and Behavior, Vol. 8, No. 2, 01.01.1977, p. 193-200.

Research output: Contribution to journalArticle

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