Navigation Links
Spread your sperm the smart way
Date:7/9/2009

maximises the number of offspring he sires overall. Less attractive males secure fewer matings but value each of them more highly, and by allocating more sperm to each mating make the most of their meagre opportunities. This leads to the rather paradoxical prediction that matings with attractive males may be less fertile than those with unattractive males."

"There are as yet few good examples of this process found in nature, as it has generally been assumed that more attractive or higher quality males will be more fertile. A possible case can be seen in chickens, which in the wild live in groups of varying numbers of males and females. Females mate with many males, so males are subject to sperm competition. However, the attractiveness of a male is determined in large part by his social standing. Males higher up the pecking order find it easier to secure matings with the females, but they transfer fewer sperm to females. In addition, the sperm of dominant birds is less motile and has lower fertilising efficiency than the sperm of subordinate birds. Scientists can artificially change the pecking order, and when this is done, the new dominant male's sperm quickly loses motility, while that of males reduced to subordinate status increases in motility."

"Further work in this area should look at males that are similarly attractive, but have different levels of resources to allocate to sperm production, to see how this alters their sperm number and quality. The model should also be expanded to include the effects of short-term sperm depletion, which is known to affect ejaculate content when males re-mate quickly. We also would like to explore whether the lower fertility of attractive males causes females to start avoiding attractive males that mate too often, as these males reduce their fertility."

"Finally, how this work applies to humans and other primates is not yet known. Human attractiveness is complicated and influenced by a number of facto
'/>"/>

Contact: Jenny Gimpel
44-020-767-99726
University College London
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. Targeting children effective use of limited supplies of flu vaccine and could help control flu spread
2. Scientists examine perceptions of risk and the spread of disease
3. LSUHSC research describes function of key protein in cancer spread
4. Bacteria play role in preventing spread of malaria
5. Social separation stops flu spread, but must be started soon
6. 3-D research model tackles prostate cancer spread
7. TGen researchers discover possible way to block the spread of deadly brain tumors
8. Minimizing the spread of deadly Hendra virus
9. UC Davis researchers identify a protein that may help breast cancer spread, beat cancer drugs
10. New wheat disease could spread faster than expected
11. Flies may spread drug-resistant bacteria from poultry operations
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:10/28/2014)... This news release is available in German . ... our close relatives, the chimpanzees, acquire sufficient food when ... Taï National Park in Côte d,Ivoire researchers of the ... provide a clear example of how great apes can ... They show that chimpanzees make their sleeping nests more ...
(Date:10/28/2014)... announced awards to expand the Office of Rare ... Advancing Translational Sciences (ORDR-NCATS) collaborative Rare Diseases Clinical ... scientists at 22 consortia will work with 98 ... investigate new treatments for patients with rare diseases. ... in fiscal 2014 funding from NIH. , Rett ...
(Date:10/28/2014)... in moving activity in a novel environment are ... according to an experimental study completed at the ... and Fisheries Research Institute. The study used novel, ... authentic angling trials to analyse if behaviours predict ... in traditional and enriched hatchery rearing environments. ...
Breaking Biology News(10 mins):The early chimp gets the fig 2The early chimp gets the fig 3NIH's ORDR-NCATS RDCRN & NICHD awards U54 cooperative agreement for natural history study 2NIH's ORDR-NCATS RDCRN & NICHD awards U54 cooperative agreement for natural history study 3Fish 'personality' linked to vulnerability to angling 2
... importance of minorities took center stage during the Presidential ... representation in our educational and technological communities? ... majorities in science, technology, engineering and math (STEM) is ... of a trio of Presidential Award for Excellence in ...
... victims, a Michigan State University research team this month ... prevent a quarter-million African children from developing epilepsy each ... the anti-seizure medication levetiracetam, or LVT, for controlling seizures ... disease that affects brain function in some three million ...
... to ensure that the risk of lead being found in domestic ... further in line with new regulations which come into ... being conducted in collaboration with Yorkshire Water, and the findings could ... the USA, have similar issues with lead dissolved from plumbing. ...
Cached Biology News:Mentoring models to move minorities to majorities in STEM 2Mentoring models to move minorities to majorities in STEM 3MSU launches groundbreaking drug trial in Africa 2Research with Yorkshire Water to reduce lead in water supplies 2
(Date:10/31/2014)... 30, 2014 Two separate delegations ... hosted by Charm Sciences at its Andover, Massachusetts ... in the US, the participants discussed international systems ... management, and process verification, and received hands-on technical ... was the first visit to the United States ...
(Date:10/31/2014)... The report "Dairy Alternative (Beverage) Market ... Sweetened, Unsweetened), Channel (Supermarket, Health Store, Pharmacy, Convenience ... to 2018," defines and segments the dairy alternative ... revenue and volume for plant-based dairy alternative beverages. ... $14 Billion by 2018 with the Asia-Pacific region ...
(Date:10/31/2014)... Fla. , Oct. 31, 2014  Tavistock ... owned by Tavistock Group, celebrated the groundbreaking of the ... Medical City. The 92,000-square-foot, three-story ... Central Florida designed specifically for ... in the heart of the 650-acre Lake Nona ...
(Date:10/30/2014)... 30, 2014  Ardelyx, Inc. (NASDAQ: ... cardio-renal, gastrointestinal and metabolic diseases, today announced that ... on Thursday, November 6, 2014. Following the announcement, ... conference call and webcast at 4:30pm ET to ... business update. The live webcast can ...
Breaking Biology Technology:Charm Sciences Hosts Executives from Latin America for Dairy Safety Executive Seminar 2Dairy Alternative Beverage Market Projected to Reach $14 Billion by 2018 - Report by MarketsandMarkets 2Dairy Alternative Beverage Market Projected to Reach $14 Billion by 2018 - Report by MarketsandMarkets 3Dairy Alternative Beverage Market Projected to Reach $14 Billion by 2018 - Report by MarketsandMarkets 4GuideWell Innovation Center Groundbreaking Hosted by Tavistock Development Company at Lake Nona Medical City 2GuideWell Innovation Center Groundbreaking Hosted by Tavistock Development Company at Lake Nona Medical City 3Ardelyx to Report Third Quarter 2014 Financial Results on November 6, 2014 2
... Novavax, Inc. (Nasdaq: NVAX ) announced today ... company,s Chief Scientific Officer who will report to Dr. ...  Previously, Dr. Glenn was Chief Scientific Officer and founder of ... Johns Hopkins University,s School of Public Health and ...
... 2010 Olivier Bohuon will be,replacing Jean-Pierre Garnier ... , , , ... Olivier Bohuon , 51, was Executive Vice-President of the Abbott,Corporation and President ... Chicago ( $22 billion in sales).,In 2003, he was named ...
... , July 1 United Therapeutics Corporation ... (HKEx: 0950) announced today that they have entered into ... Injection in China .  Remodulin is a subcutaneously ... pulmonary arterial hypertension.  Lee,s Pharmaceutical is a leading Chinese ...
Cached Biology Technology:Novavax Announces Appointment of Dr. Gregory Glenn as Chief Scientific Officer 2Novavax Announces Appointment of Dr. Gregory Glenn as Chief Scientific Officer 3Novavax Announces Appointment of Dr. Gregory Glenn as Chief Scientific Officer 4Olivier Bohuon Joins Pierre Fabre 2United Therapeutics and Lee's Pharmaceutical Sign Remodulin Distribution Agreement for China 2United Therapeutics and Lee's Pharmaceutical Sign Remodulin Distribution Agreement for China 3United Therapeutics and Lee's Pharmaceutical Sign Remodulin Distribution Agreement for China 4United Therapeutics and Lee's Pharmaceutical Sign Remodulin Distribution Agreement for China 5
Phospho-mu-Opioid Receptor (Ser375) Antibody...
Arginine vasopressin receptor (AVP-V2), rat. The peptide used for immunization has no significant similarity with AVP V1a or V1b receptors....
Rabbit polyclonal to Olfactory Receptor LS189744 ( Abpromise for all tested applications)....
Rabbit polyclonal to Orexin Prepro ( Abpromise for all tested applications). entrezGeneID: 3060 SwissProtID: O43612...
Biology Products: