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KB hormonal mengubah komunikasi aroma pada primata
Kontrasepsi
hormonal mengubah cara lemur ekor cincin
captive berhubungan satu sama lain baik secara sosial dan seksual, menurut
sebuah studi yang dikombinasikan dengan analisis hormon, gen, bahan kimia aroma
dan perilaku......read more
..............................
Hormonal birth
control alters scent communication in primates
Date:
July 29, 2010
Source:
Duke University
Summary:
Hormonal
contraceptives change the ways captive ring-tailed lemurs relate to one another
both socially and sexually, according to a study that combined analyses of
hormones, genes, scent chemicals and behavior.
....................
hormonal contraceptives
change the ways captive ring-tailed lemurs relate to one another both socially
and sexually, according to a Duke University study that combined analyses of
hormones, genes, scent chemicals and behavior.
Contraception alters the chemical cues these scent-reliant animals use to
determine genetic fitness, relatedness and individuality. And, as a sort of
double whammy to birth-control efforts, male lemurs were shown to be less
interested in females that were treated with contraceptives.
"Hormonal contraception is known to alter the attractiveness of scent
cues in humans and the presence of fertility cues in other primates," said
Christine Drea, an associate professor of evolutionary anthropology at Duke.
"We wanted to understand all the ways in which contraception changes scent
cues and the subsequent way these animals might interact with each other."
A dozen female lemurs at the Duke Lemur Center were given monthly
injections of the contraceptive Medroxyprogesterone acetate, or MPA, (marketed
as Depo-Provera by Pfizer). Drea's chemical analysis found that they expressed
different scent molecules than "intact" females, significantly
altering the signals females send about themselves to social contacts and
prospective partners. In other words, they smell funny.
The findings are part of a series of studies that Drea's group has done
using chromatography to tease apart the chemical components of the rich stew of
scents produced by lemurs. A female lemur's scent normally conveys not only her
fertility status, but also information about identity, her relatedness to
others and her genetic homozygosity, an indicator of in-breeding.
If all of that information is scrambled by hormonal contraception, it may
in part explain changed patterns of aggression that other studies have noted
when captive primates are treated with contraceptives, Drea said.
In this study, the 12 females served as both intact and contracepted
females by being sampled in each condition. Under contraception, the females
were found to express some scents that intact females do not, and to express
scents in different proportions. The contracepted females also tended to lose
their scent individuality.
"There's something very different about these gals," Drea said.
"If animals are figuring out who their kin are by scent, she no longer
smells like her brother."
In behavioral tests, the 13 males in the study showed clear preferences for
the scents of intact females, spending less time investigating odor samples
from contracepted females.
The bigger question is whether these findings are relevant for our own
species, Drea said. Humans are known to send and receive olfactory cues about
hormonal status and possible compatibility. "One has to wonder if human
mate choice might be affected in some of the same ways it has been in these
primates," Drea said.
The research, supported by the U.S. National Science Foundation, appears
online inProceedings of the Royal Society B.
Story Source:
The above story is based on materials provided by Duke University. The original article was written by
Karl Leif Bates. Note: Materials may be edited for content and length.
