HOME >> BIOLOGY >> NEWS
Meaningless sex? Male mounting reduces sexual promiscuity of females

Fakery is seen throughout the animal kingdom and is especially evident in the realm of mate selection and mating behavior. A puzzling behavior frequently observed in many species is copulation between males and females without the delivery of semen. In a world where reproduction is key to a species, survival, such behavior poses a real mystery. In a study that sheds new light on the evolution of sexual behavior, researchers have utilized a novel technique to reveal that in feral chickens, the simple stimulus generated by male mounting--in the absence of actual insemination--reduces the sexual promiscuity of a hen, indicating that even copulations that do not result in semen transfer may be crucial to defend the paternity of a male.

Females of many species often copulate with multiple males, leading to the phenomenon of sperm competition--the competition between the ejaculates of different males to successfully fertilize eggs. The battles of sperm competition occur at the cellular and molecular levels and involve the production of sperm-associated substances that boost the competitiveness of a male's sperm; however, the production of these substances comes at an energetic cost to males. Males who can avoid such costs--and still successfully mate--may be at a reproductive advantage. Therefore, in some species, males may avoid sperm competition by preventing females from mating with other males. However, previous studies have not fully considered the possibility that female promiscuity may be inhibited by stimuli generated by the simple act of male mounting.

In the new study, a team of researchers led by Dr. Tommaso Pizzari of the University of Oxford tested this idea in the feral chicken, a sexually promiscuous species. By using a novel but technologically simple technique--fitting some hens with a light plastic harness covering their cloaca and thus preventing insemination--the researchers were able to separate the effect of insemination products fro
'"/>

Contact: Heidi Hardman
hhardman@cell.com
1-617-397-2879
Cell Press
11-Jul-2005


Page: 1 2

Related biology news :

1. Adding folic acid to flour significantly reduces congenital malformations
2. Climate change reduces Queenslands bat numbers
3. Pre-implantation genetic screening reduces both ongoing pregnancy and live birth rates in over 35s
4. Noninvasive screening in early pregnancy reduces Downs births by 50 percent
5. Recycled garden compost reduces phosphorus in soils
6. Not so contoversial anymore -- panel says moderate coffee drinking reduces many risks
7. Apple consumption during pregnancy reduces risk for childhood wheezing and asthma
8. DNA layer reduces risk of reserve parts being rejected
9. Diesel exposure model reduces allergy risk assessment errors
10. Anti-herpes treatment reduces HIV levels in women infected with both viruses
11. Active lifestyle reduces risk of invasive breast cancer

Post Your Comments:
(Date:2/5/2015)... --NXT-ID, Inc. (NASDAQ: NXTD and NXTDW) ... on the growing mobile commerce market, announces the launch ... part of its 2015 marketing and branding initiatives for ... consumer website for Wocketwallet.com earlier this month. ... "Our new corporate website naturally showcases our premiere consumer ...
(Date:2/5/2015)... Jan. 30, 2015  It is gratifying to see ... potential for genomic science as a means to better ... and treatment.  I was honored to participate in today,s ... medicine program. Since the 1980s my ... genomics—from the first sequenced genome of a free living ...
(Date:1/22/2015)... Fla. , Jan. 13, 2015  Today, FreeWavz ... technology, launched its crowdfunding campaign on Fundable, ... the build of production capacity to meet customer ... Photo - http://photos.prnewswire.com/prnh/20150113/168790 ...
Breaking Biology News(10 mins):NXT-ID, Inc. Launches New Corporate Website As Part Of Ongoing 2015 Branding Initiatives For Wocket Smart Wallet 2NXT-ID, Inc. Launches New Corporate Website As Part Of Ongoing 2015 Branding Initiatives For Wocket Smart Wallet 3J. Craig Venter, Ph.D., Co-Founder and CEO, Human Longevity, Inc. (HLI) Participates in White House Precision Medicine Event 2FreeWavz Launches on Fundable to Drive Speed-to-Market in 2015 2
(Date:3/5/2015)... Plant disease specialists from around the ... Annual Meeting of The American Phytopathological Society. Details ... now at APSnet.org/meet . , The Preliminary Daily ... be held August 1-5, 2015 in Pasadena, California, U.S.A. ... Workshops, and committee meetings, all carefully balanced to deliver ...
(Date:3/5/2015)... Bi-Biomics today announced a discovery made ... The improvement in histological quality provided the detail ... all daughter cells. , After processing with Ultralight ... at 1000-1600x using light microscopy. Phylogenetic and ... daughter cells displayed predominant binary features --- one ...
(Date:3/5/2015)... TORONTO , March 5, 2015 /PRNewswire/ - Aptose ... developing new therapeutics and molecular diagnostics that target the ... G. Rice , Ph.D., Chairman, President and Chief Executive ... Conference on Tuesday, March 10 th at 9:30 ... Laguna Niguel, CA. Dr. Rice will provide ...
(Date:3/5/2015)... DUBLIN , Mar. 05, 2015 Research and ... addition of the "Mature Biotech Outlook 2015: New ... to their offering. All biotech companies ... Celgene (CELG), in past year, have given a positive ... These companies have been able to select therapy/niche indication ...
Breaking Biology Technology:American Phytopathological Society Announces Annual Meeting Daily Schedule 2Aptose Biosciences to Present at the 27th Annual ROTH Conference 2Aptose Biosciences to Present at the 27th Annual ROTH Conference 3Mature Biotech Outlook 2015: New Therapy Ventures Pave the Way for Success 2Mature Biotech Outlook 2015: New Therapy Ventures Pave the Way for Success 3
Cached News: