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Literature DB >> 17482616

The ram as a model for behavioral neuroendocrinology.

Abstract

The sheep offers a unique model to study male sexual behavior and sexual partner preference. Rams are seasonal breeders and show the greatest libido during short days coincident with the resumption of ovarian cyclicity in the ewe. Threshold concentrations of testosterone are required for the acquisition and display of adult sexual behavior. In addition, estrogens produced from circulating testosterone by cytochrome P450 aromatase in the preoptic area are critical for the maintenance of sexual behaviors in rams. Sex differences in adult reproductive behaviors and hormone responsiveness are the result of permanent organizational effects exerted by testosterone and its metabolites on brain development. Early exposure to ewes enhances ram sexual performance, but cannot prevent some rams from exhibiting male-oriented sexual partner preferences. Neurochemical and neuroanatomical studies suggest that male-oriented ram behavior may be a consequence of individual variations in brain sexual differentiation.

Entities: Chemical Disease Species

Mesh：

Year: 2007 PMID： 17482616 PMCID： PMC2150593 DOI： 10.1016/j.yhbeh.2007.03.016

Source DB: PubMed Journal: Horm Behav ISSN： 0018-506X Impact factor: 3.587

47 in total

1. Libido and scrotal circumference of rams as affected by season of the year and altered photoperiod.

Authors: D Tulley; P J Burfening
Journal: Theriogenology Date: 1983-10 Impact factor: 2.740

Review 2. Mammalian animal models of psychosexual differentiation: when is 'translation' to the human situation possible?

Authors: Michael J Baum
Journal: Horm Behav Date: 2006-07-28 Impact factor: 3.587

3. Seasonal changes in sexual activity and serum levels of LH and testosterone in Finnish Landrace and Suffolk rams.

Authors: B D Schanbacher; D D Lunstra
Journal: J Anim Sci Date: 1976-09 Impact factor: 3.159

4. The relationship between circulating testosterone levels and male sexual behavior in rats.

Authors: D A Damassa; E R Smith; B Tennent; J M Davidson
Journal: Horm Behav Date: 1977-06 Impact factor: 3.587

5. Copulatory behaviour of the ram, Ovis aries. 3. Effects of pre- and postpubertal castration and androgen replacement therapy.

Authors: M T Clegg; W Beamer; G Bermant
Journal: Anim Behav Date: 1969-11 Impact factor: 2.844

6. The relationship between sexual and aggressive behaviour, and pituitary and testicular activity during the seasonal sexual cycle of rams, and the influence of photoperiod.

Authors: G A Lincoln; W Davidson
Journal: J Reprod Fertil Date: 1977-03

7. The sexual behaviour of prenatally androgenized ewes observed in the field.

Authors: I J Clarke
Journal: J Reprod Fertil Date: 1977-03

Review 8. Sexual differentiation of the neuroendocrine control of gonadotrophin secretion: concepts derived from sheep models.

Authors: D L Foster; V Padmanabhan; R I Wood; J E Robinson
Journal: Reprod Suppl Date: 2002

9. Sexual differentiation of aromatase activity in the rat brain: effects of perinatal steroid exposure.

Authors: C E Roselli; S A Klosterman
Journal: Endocrinology Date: 1998-07 Impact factor: 4.736

10. The volume of a sexually dimorphic nucleus in the ovine medial preoptic area/anterior hypothalamus varies with sexual partner preference.

Authors: Charles E Roselli; Kay Larkin; John A Resko; John N Stellflug; Fred Stormshak
Journal: Endocrinology Date: 2003-10-02 Impact factor: 4.736

16 in total

The ram as a model for behavioral neuroendocrinology.

1. Libido and scrotal circumference of rams as affected by season of the year and altered photoperiod.

Review 2. Mammalian animal models of psychosexual differentiation: when is 'translation' to the human situation possible?

3. Seasonal changes in sexual activity and serum levels of LH and testosterone in Finnish Landrace and Suffolk rams.

4. The relationship between circulating testosterone levels and male sexual behavior in rats.

5. Copulatory behaviour of the ram, Ovis aries. 3. Effects of pre- and postpubertal castration and androgen replacement therapy.

6. The relationship between sexual and aggressive behaviour, and pituitary and testicular activity during the seasonal sexual cycle of rams, and the influence of photoperiod.

7. The sexual behaviour of prenatally androgenized ewes observed in the field.

Review 8. Sexual differentiation of the neuroendocrine control of gonadotrophin secretion: concepts derived from sheep models.

9. Sexual differentiation of aromatase activity in the rat brain: effects of perinatal steroid exposure.

10. The volume of a sexually dimorphic nucleus in the ovine medial preoptic area/anterior hypothalamus varies with sexual partner preference.

Review 1. A genetic approach to dissect sexually dimorphic behaviors.

2. Science journalism: Let's talk about sex.

3. Aromatase promoter I.f is regulated by progesterone receptor in mouse hypothalamic neuronal cell lines.

Review 4. Programmed for Preference: The Biology of Same-Sex Attraction in Rams.

Review 5. The development of male-oriented behavior in rams.

Review 6. Neurobiology of gender identity and sexual orientation.

Review 7. Brain aromatization: classic roles and new perspectives.

Review 8. Representing sex in the brain, one module at a time.

Review 9. Neuropeptide and steroid hormone mediators of neuroendocrine regulation.

Review 10. Sex differences in partner preferences in humans and animals.