Message Number: SG18403 | New FHL Archives SearchFrom: sukiec@optonline.net
Date: Thu, 5 Oct 2006 23:00:45 +0100 (BST)
To: ferrethealth@smartgroups.com
Subject: [ferrethealth] Abstract
START QUOTE
Horm Behav. 2006 Sep 29; [Epub ahead of print] =
Ventromedial hypothalamic nucleus lesions disrupt olfactory mate recognitio=
n and receptivity in female ferrets.
Robarts DW, =
Baum MJ.
Department of Biology, Boston University, Boston, MA 02215, USA.
Previous research showed that ferrets of both sexes rely on the perception =
of conspecifics' body odors to identify and motivate approach towards oppos=
ite-sex mating partners, and exposure to male body odors stimulated Fos exp=
ression in an olfactory projection circuit of female, but not male, ferrets=
that terminates in the ventromedial hypothalamic nucleus (VMH). We asked w=
hether the female-typical preference of ferrets to approach male as opposed=
to female body odors in Y-maze tests would be disrupted by VMH lesions. Se=
xually experienced female ferrets were ovo-hysterectomized prior to receivi=
ng bilateral electrolytic lesions of the VMH, the preoptic area/anterior hy=
pothalamus (POA/AH) or a sham operation. Subsequently, while receiving estr=
adiol benzoate, females that received either complete or partial bilateral =
lesions of the VMH approached volatile odors from an anesthetized male on s=
ignificantly fewer trials than females given POA/AH lesions or a sham opera=
tion. Both groups of ferrets with VMH lesion damage reliably discriminated =
between volatile anal scents as well as urinary odors from the 2 sexes in h=
ome cage habituation/dishabituation tests, suggesting that their odor-based=
sex discrimination remained intact. Females with complete bilateral VMH le=
sions showed significantly lower acceptance of neck gripping from a stimulu=
s male (receptivity) and more aggression towards the male than all other gr=
oups of female subjects. Estrogen-sensitive neurons in the VMH appear to pl=
ay a central role in female-typical neural processing of odor inputs leadin=
g to a preference to seek out a male sex partner, in addition to facilitati=
ng females' sexual receptivity.
PMID: 17011561 [PubMed - as supplied by publisher]
END QUOTE
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