Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Sex in the morning or in the evening?

21.05.2007
Hens solicit sex in the morning to avoid sexual harassment in male-dominated groups of chickens, shown in a new study by Hanne Løvlie of Stockholm University, Sweden, and Dr Tommaso Pizzari of the University of Oxford, UK.

In the animal kingdom, males more often than females can increase their reproductive success by being promiscuous. This in turn can result in males imposing high numbers of copulation attempts and sexual harassment on females.

In the promiscuous feral chicken, males initiate more than 90 per cents of all copulation attempts; most of them in the evening after hens have laid their eggs and are most fertile. In female-dominated groups hens are also interested in sex in evenings. However, as shown in a new study published in American Naturalist, in male-dominated groups hens rather initiate sex in mornings.

'Sexual harassment in evenings in male-dominated groups may just be too much for the hens', says Hanne Løvlie from Stockholm University, one of the researchers of the study. 'Hens were exposed to more intense sexual harassment in male-dominated group. By initiate sex in mornings when the cockerels are less amorous and the free-ranging chickens also are more spread out foraging, hens may avoid the intense sexual harassment in evenings.'

The study shows that changes in the intensity of sexual harassment trigger a plasticity in the hens' sexual behaviour not before shown. A plasticity that in turn may enable hens to mate without suffering sexual harassment.

'The sexes therefore not only fall out on how much sex they want, but also when at day to have it', says Hanne Løvlie.

Contact Information
Hanne Løvlie, Department of Zoology, Stockholm University, tel +46 73 6394497, +46 8 16 48 96, e-mail hanne.lovlie@zoologi.su.se.

Maria Sandqvist | idw
Further information:
http://www.vr.se

More articles from Studies and Analyses:

nachricht New study from the University of Halle: How climate change alters plant growth
12.01.2018 | Martin-Luther-Universität Halle-Wittenberg

nachricht Disarray in the brain
18.12.2017 | Universität zu Lübeck

All articles from Studies and Analyses >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Artificial agent designs quantum experiments

On the way to an intelligent laboratory, physicists from Innsbruck and Vienna present an artificial agent that autonomously designs quantum experiments. In initial experiments, the system has independently (re)discovered experimental techniques that are nowadays standard in modern quantum optical laboratories. This shows how machines could play a more creative role in research in the future.

We carry smartphones in our pockets, the streets are dotted with semi-autonomous cars, but in the research laboratory experiments are still being designed by...

Im Focus: Scientists decipher key principle behind reaction of metalloenzymes

So-called pre-distorted states accelerate photochemical reactions too

What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...

Im Focus: The first precise measurement of a single molecule's effective charge

For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.

Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...

Im Focus: Paradigm shift in Paris: Encouraging an holistic view of laser machining

At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.

No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...

Im Focus: Room-temperature multiferroic thin films and their properties

Scientists at Tokyo Institute of Technology (Tokyo Tech) and Tohoku University have developed high-quality GFO epitaxial films and systematically investigated their ferroelectric and ferromagnetic properties. They also demonstrated the room-temperature magnetocapacitance effects of these GFO thin films.

Multiferroic materials show magnetically driven ferroelectricity. They are attracting increasing attention because of their fascinating properties such as...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

10th International Symposium: “Advanced Battery Power – Kraftwerk Batterie” Münster, 10-11 April 2018

08.01.2018 | Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

 
Latest News

Thanks for the memory: NIST takes a deep look at memristors

22.01.2018 | Materials Sciences

Radioactivity from oil and gas wastewater persists in Pennsylvania stream sediments

22.01.2018 | Earth Sciences

Saarland University bioinformaticians compute gene sequences inherited from each parent

22.01.2018 | Life Sciences

VideoLinks Wissenschaft & Forschung
Overview of more VideoLinks >>>