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:4/27/2015)... Profile Solutions, Inc. (OTC: PSIQ), a leading ... pleased to announce that Dr Gerry Bedore ... of its scientific advisory board. ... leader in technology-enhanced learning models. He was a co-founder ... studies and books focused on online student success and ...
(Date:4/20/2015)... , April 20, 2015 Huntington Memorial Hospital ... to implant a new miniaturized, wireless monitoring sensor to ... the first and only FDA-approved heart failure monitoring device ... when used by physicians to manage heart failure. ... is implanted in the pulmonary artery (PA) during a ...
(Date:4/17/2015)... BURNABY, Canada , April 17, 2015 /PRNewswire/ ... projects, growing security concerns, and technological advancement to ... Arabia until 2020   ... " Saudi Arabia Biometric Systems Market Forecast &  Opportunities, 2020 ", biometric ... is projected to register growth at CAGR ...
Breaking Biology News(10 mins):Profile Solutions Names Medicinal Cannabis, Agriculture and Technology Expert Dr. Gerry Bedore to its Scientific Advisory Board 2Profile Solutions Names Medicinal Cannabis, Agriculture and Technology Expert Dr. Gerry Bedore to its Scientific Advisory Board 3Profile Solutions Names Medicinal Cannabis, Agriculture and Technology Expert Dr. Gerry Bedore to its Scientific Advisory Board 4Huntington Memorial Hospital Becomes First in the San Gabriel Valley to Offer Patients a New Heart Failure Monitoring Solution 2Huntington Memorial Hospital Becomes First in the San Gabriel Valley to Offer Patients a New Heart Failure Monitoring Solution 3Saudi Arabia Biometric Systems Market to Grow at 22% Through 2020, Says TechSci Research 2Saudi Arabia Biometric Systems Market to Grow at 22% Through 2020, Says TechSci Research 3
... Nearly 50% of couples who were interviewed at least 3 ... their surplus, stored embryos for stem cell research, according to ... April 26, 2007, advanced online publication of Cell Stem Cell, ... International Society for Stem Cell Research. , The key ...
... MIT Media Lab have invented a way to reversibly ... the prospect of controlling the haywire neuron activity that ... , Such diseases often must be treated by removing ... lead to the development of optical brain prosthetics to ...
... Dick at Ontario Cancer Institute (OCI) have developed a method ... stem cells. The converted cells, when transplanted into special mice ... entire disease process from the very moment it begins. The ... Dick, Senior Scientist at OCI, the research arm of Princess ...
Cached Biology News:Many couples choose to donate surplus embryos for stem cell research 2MIT: Pulsing light silences overactive neurons 2Cancer scientists create 'human' leukemia process to map how disease begins, progresses 2
(Date:6/2/2015)... 2, 2015  RXi Pharmaceuticals Corporation (NASDAQ: ... on discovering and developing innovative therapies primarily ... today announced that Dr. Pamela Pavco , ... the 23 rd World Congress of ... include in-depth presentations by world-class clinicians and/or ...
(Date:6/2/2015)... 2, 2015  Alere Inc. (NYSE: ALR ... the White House Antibiotic Stewardship Forum today to ... and advance the President,s National Action Plan to ... number of measurable goals and objectives over the ... healthcare providers protect their patients through antibiotic stewardship, ...
(Date:6/2/2015)... Through rare discovery of new physics ... is enabling World Scientists to actually see, watch, ... displaying the full nature (position, shape, size, number) of ... Porter, Co-Founder of the Yancy Corporation, says, "Our rare ... They come once in a lifetime, if at all. ...
(Date:6/2/2015)... Sunnyvale, CA (PRWEB) June 02, 2015 ... their official United States distributor for the Moenninghoff ... Finger stated, “I am pleased to announce that the ... U.S. market. For our firm, founded in 1916, this ... that R.M. Hoffman is the kind of professional distributor ...
Breaking Biology Technology:RXi Pharmaceuticals to Present at the 23rd World Congress of Dermatology 2RXi Pharmaceuticals to Present at the 23rd World Congress of Dermatology 3RXi Pharmaceuticals to Present at the 23rd World Congress of Dermatology 4Alere Announces Broad Initiatives to Help Combat Antibiotic Resistance during White House Antibiotic Stewardship Forum 2Scientists Eying Rare Discovery Of New Physics & Light Microscope Technology 2R.M. Hoffman Company designated official United States distributor for the Moenninghoff product line. 2R.M. Hoffman Company designated official United States distributor for the Moenninghoff product line. 3
... CITY, Oct. 28 /PRNewswire-FirstCall/ - AEterna Zentaris Inc.,(NASDAQ: ... company focused on,endocrine therapy and oncology, today announced ... Paul Blake, MD, will present a company,overview at ... November 3, 2008 at 8:00 am (Eastern Time), ...
... at the ... conference, booth 519, ... development of cost-effective, easy-to-use gene-expression analysis,systems, announced that renowned breast ... in the Department of,Biochemistry and Molecular Biology at the University ...
... bones of mammals, the protective shells of mollusks, and the ... made-from-scratch wonders of nature. , Used to crush food, for ... teeth and bones are composed are the strongest and most ... long sought to mimic them. , Now, harnessing the process ...
Cached Biology Technology:James L. Wittliff, Ph.D., FACB, to Present 'Predicting Breast Cancer Outcome with Gene Expression Signatures on the Ziplex(R) System' at the Association for Molecular Pathology Conference, October 30 2James L. Wittliff, Ph.D., FACB, to Present 'Predicting Breast Cancer Outcome with Gene Expression Signatures on the Ziplex(R) System' at the Association for Molecular Pathology Conference, October 30 3Sea urchin yields a key secret of biomineralization 2Sea urchin yields a key secret of biomineralization 3
Mouse monoclonal antibody to ST8SIA2 - ST8 alpha-N-acetyl-neuraminide alpha-2,8-sialyltransferase 2...
... Analyzer and Sorter) large particle flow cytometers ... flow cytometry to applications that were not ... and sorting. Our instruments are based ... cytometers, but are designed to accommodate much ...
Mouse polyclonal antibody raised against a partial recombinant AGTRAP. NCBI Entrez Gene ID = 57085...
... raised against a partial recombinant ... SF3B2 (NP_006833, 592 a.a. ... protein with GST tag. ... NM_006842 Protein ...
Biology Products: