Homosexual sheep exhibit physical differences
Posted by:: Baldin Pramer
Date: Sun, 06 Mar 2005 09:48:25 -0700
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http://endo.endojournals.org/cgi/content/abstract/145/2/478
The Volume of a Sexually Dimorphic Nucleus in the Ovine Medial Preoptic
Area/Anterior Hypothalamus Varies with Sexual Partner Preference
Charles E. Roselli, Kay Larkin, John A. Resko, John N. Stellflug and
Fred Stormshak
Department of Physiology and Pharmacology, Oregon Health & Science
University (C.E.R., K.L., J.A.R.), Portland, Oregon 97239; Department of
Animal Sciences, Oregon State University (F.S.), Corvallis, Oregon
97331; and Agricultural Research Service, United States Sheep Experiment
Station (J.N.S.), Dubois, Idaho 83423
Address all correspondence and requests for reprints to: Dr. Charles E.
Roselli, Department of Physiology and Pharmacology L334, Oregon Health &
Science University, 3181 S.W. Sam Jackson Park Road, Portland, Oregon
97201-3098. E-mail: rosellic@ohsu.edu.
Sheep are one of the few animal models in which natural variations in
male sexual preferences have been studied experimentally. Approximately
8% of rams exhibit sexual preferences for male partners (male-oriented
rams) in contrast to most rams, which prefer female partners
(female-oriented rams). We identified a cell group within the medial
preoptic area/anterior hypothalamus of age-matched adult sheep that was
significantly larger in adult rams than in ewes. This cell group was
labeled the ovine sexually dimorphic nucleus (oSDN). In addition to a
sex difference, we found that the volume of the oSDN was two times
greater in female-oriented rams than in male-oriented rams. The dense
cluster of neurons that comprise the oSDN express cytochrome P450
aromatase. Aromatase mRNA levels in the oSDN were significantly greater
in female-oriented rams than in ewes, whereas male-oriented rams
exhibited intermediate levels of expression. Because the medial preoptic
area/anterior hypothalamus is known to control the expression of male
sexual behaviors, these results suggest that naturally occurring
variations in sexual partner preferences may be related to differences
in brain anatomy and capacity for estrogen synthesis.
--
Sir Baldin Pramer, R.P.A.
Pramer's law:
The longer the thread, the greater the likelihood of Godwin's law being
brandished by someone who is unfamiliar with Godwin's law.
Posted by:: "Doktor Dark"
Date: 6 Mar 2005 10:02:51 -0800
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There is a book caled "Brain Sex" which details physiologic differences
in brain structure between males & females. It also references specific
structural differences between "gay" & "straight" brains of both
genders, as well as the mechanisms, during pregnancy, which causes
these to arise. Which is why legislating illegality of gay marriage is
no different from making interracial marriage illegal, something the
Normworms in AmeriKKKa would not dare legislate, much as they would
secretly like to.