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:5/18/2015)... May 18, 2015 Fingerprint Cards (FPC) ... FPC1025, FPC1145, FPC1155 and FPC1035 from one if its module ... and including Q3 2015 and the sensors will be used ... order values for 2015 hereby amount to 740 MSEK to ... of 140 MSEK and a number of smaller orders not ...
(Date:5/11/2015)... 2015  Synaptics Incorporated (NASDAQ: SYNA ), ... announced the appointment of Wajid Ali ... reporting to Rick Bergman , President and ... Officer, Kathleen Bayless , who announced her ... Ali brings extensive financial management expertise to Synaptics, ...
(Date:5/10/2015)... 2015 Fingerprint Cards (FPC) has received ... from the distributor World Peace Industrial Group (WPI), part of ... Asia . Deliveries are planned to take place ... smartphone manufacturers in China . The order ... guidance of + 1 000 MSEK for 2015.   ...
Breaking Biology News(10 mins):Fingerprint Cards Receives Touch Fingerprint Sensor Order of SEK 230 Million and Raises Revenue Guidance for 2015 2Synaptics Appoints Wajid Ali as Senior Vice President and Chief Financial Officer 2Fingerprint Cards Receives Touch Fingerprint Sensor Order of SEK 235 Million 2
(Date:5/27/2015)... , May 27, 2015 ­ Caris ... the promise of precision medicine, today announced it has ... System, a center of excellence site in the Caris ... Levine Cancer Institute is one of the ... more than 11,000 new cancer patients annually. Derek ...
(Date:5/26/2015)... Regenestem Network has announced the grand opening ... Argentina. The clinic will be lead by Silvina Pastrana, ... a multidisciplinary team of medical professionals who specialize in ... office. , The new Regenestem Network members plan ... in cellular therapies, and establish Regenestem protocols to isolate ...
(Date:5/26/2015)... CA (PRWEB) May 26, 2015 ... and solutions in the human and animal health ... annual Vetericyn® Future Innovators of Agriculture College Scholarship ... school senior who exhibits a passionate commitment to ... , This year’s winners, Alexis Pedrow from ...
(Date:5/26/2015)... and HILDEN, Germany , May ... (NASDAQ: QGEN ; Frankfurt Prime Standard: QIA) ... Clinical Insight ® (QCI™) bioinformatics content and ... and report on genomic variants identified in next-generation ... the bioinformatics platform are in oncology, for somatic ...
Breaking Biology Technology:Caris Life Sciences Designates Levine Cancer Institute as a Caris Center of Excellence 2Caris Life Sciences Designates Levine Cancer Institute as a Caris Center of Excellence 3Caris Life Sciences Designates Levine Cancer Institute as a Caris Center of Excellence 4Regenestem Network and Silvina Pastrana, M.D. Announce the Opening of a New Stem Cell Clinic in Buenos Aires 2Regenestem Network and Silvina Pastrana, M.D. Announce the Opening of a New Stem Cell Clinic in Buenos Aires 3Innovacyn Announces Winners Of This Year’s Vetericyn® College Scholarship Award 2Innovacyn Announces Winners Of This Year’s Vetericyn® College Scholarship Award 3QIAGEN Launches Clinical Bioinformatics Platform for Next-Generation Sequencing 2QIAGEN Launches Clinical Bioinformatics Platform for Next-Generation Sequencing 3QIAGEN Launches Clinical Bioinformatics Platform for Next-Generation Sequencing 4QIAGEN Launches Clinical Bioinformatics Platform for Next-Generation Sequencing 5
Cached News: