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:11/5/2014)... – Kelly Redmond has dedicated his career to ... to a general audience. , As deputy director ... Center at Nevada,s Desert Research Institute, Redmond has ... management, application and dissemination of climate data to ... Fall Meeting in San Francisco on December 15-19, ...
(Date:11/4/2014)... Temple University School of Medicine announced today that ... initiative funded by the Bill & Melinda Gates ... Obstetrics, Gynecology and Reproductive Sciences; and Vice Chair ... School of Medicine will pursue an innovative global ... Biomarkers to Assess Fetal Neurodevelopment.", Grand Challenges Explorations ...
(Date:11/4/2014)... majority of Madagascar,s 101 species of lemurs are threatened ... the rainforests they call home. A new study by ... have on rainforest tree populations, which raises concerns about ... region,s rich biodiversity. , A large proportion of trees ... Lemurs in turn disperse the seeds of their fruit ...
Breaking Biology News(10 mins):Nevada climatologist to be honored at AGU Fall Meeting for lifetime of public outreach 2Temple University School of Medicine receives Grand Challenges Explorations grant 2Gardeners of Madagascar rainforest at risk 2Gardeners of Madagascar rainforest at risk 3
... be used to produce an organic substrate for use in ... advantage that it can be recycled and is more economic ... , These are the findings of researchers at the ... in Ziordia (Navarre), have developed this substrate material. The product ...
... University of Manchester have created a new type of 'bio-gel' ... 3D, as published in the journal Advanced Materials (March 2006). ... from combinations of dipeptides (pairs of amino acids) to provide ... conditions. , Uniquely, the gel mimics the properties of cell ...
... of human DNA have different structures that are treated differently ... found in a study that could help lead to cancer ... issue of the journal Molecular Cell ?focuses on the ends ... time the cell divides, the telomeres shorten. When they become ...
Cached Biology News:New organic substrate 2Manchester scientists create new bio-gel for 3D cell culture 2DNA end caps may lead to cancer treatments, UT Southwestern researchers report 2
(Date:11/26/2014)... November 26, 2014 PMG Research, Inc. ... PMG Research is a network of sites that provide clinical ... over 2 million patient lives through its partnerships with large ... of 11 hub site locations in the Southeastern United States ... term of the board will be held by: ...
(Date:11/26/2014)... Silicon Valley Electronic Data Capture (EDC) provider ... provider of clinical research and data management services to ... its CRO Partnership Program, Clinovo expands ClinCapture , ... , “We have found Clinovo’s ClinCapture to exceed our ... is both user friendly and easy to deploy. The ...
(Date:11/26/2014)... 25, 2014 Global biostimulants market ... growing at an estimated CAGR of 12.5%. In ... food products with least ecological impacts, farmers are ... to boost crop yield more effectively & efficiently. ... can improve the return on investments. , Leading ...
(Date:11/26/2014)... and WILMINGTON, DE (PRWEB) November 26, 2014 ... Annual MPN Heroes recognition reception on December 5, 2014, ... Hematology’s annual meeting. The MPN Heroes event will honor ... in the field of myeloproliferative neoplasms (MPNs). , ... "Nashville," will discuss his family's cancer journey at the ...
Breaking Biology Technology:PMG Research Names Medical Advisory Board 2PMG Research Names Medical Advisory Board 3RPM Alliance Joins Clinovo’s CRO Partnership Program, Further Strengthening Its Presence in Southern California and India 22019 Biostimulants Market to Grow at a CAGR of 12.5% Says a New Research Report Available at RnRMarketResearch.com 22019 Biostimulants Market to Grow at a CAGR of 12.5% Says a New Research Report Available at RnRMarketResearch.com 32019 Biostimulants Market to Grow at a CAGR of 12.5% Says a New Research Report Available at RnRMarketResearch.com 4CURE Magazine and Incyte to Honor MPN Heroes 2CURE Magazine and Incyte to Honor MPN Heroes 3CURE Magazine and Incyte to Honor MPN Heroes 4
... Inc.,("Oncolytics") (TSX:ONC, NASDAQ:ONCY) today announced its financial results,and ... 31, 2008., "We are currently enrolling or ... four exploring the use of REOLYSIN(R) as a ... combination with a variety of,chemotherapies, immune modulation and ...
... batch of bluetongue Bovilis BTV8 vaccine released to supply Northern ... ... Animal Health (NYSE: SGP ) released the first batch,of Bovilis ... company, combining after the acquisition in 2007 the,strength of Intervet and ...
... BOSTON, April 30 Today John C. Lechleiter,Ph.D., ... (NYSE: LLY ), provided,insight into the future ... that,key players, significant investments in the sector are ... Conference, a gathering of,policymakers, business leaders and academics, ...
Cached Biology Technology:Oncolytics Biotech Inc. Announces 2008 First Quarter Results 2Oncolytics Biotech Inc. Announces 2008 First Quarter Results 3Oncolytics Biotech Inc. Announces 2008 First Quarter Results 4Oncolytics Biotech Inc. Announces 2008 First Quarter Results 5Oncolytics Biotech Inc. Announces 2008 First Quarter Results 6Oncolytics Biotech Inc. Announces 2008 First Quarter Results 7Oncolytics Biotech Inc. Announces 2008 First Quarter Results 8Oncolytics Biotech Inc. Announces 2008 First Quarter Results 9Oncolytics Biotech Inc. Announces 2008 First Quarter Results 10Oncolytics Biotech Inc. Announces 2008 First Quarter Results 11Oncolytics Biotech Inc. Announces 2008 First Quarter Results 12Oncolytics Biotech Inc. Announces 2008 First Quarter Results 13Oncolytics Biotech Inc. Announces 2008 First Quarter Results 14Oncolytics Biotech Inc. Announces 2008 First Quarter Results 15Oncolytics Biotech Inc. Announces 2008 First Quarter Results 16Oncolytics Biotech Inc. Announces 2008 First Quarter Results 17Oncolytics Biotech Inc. Announces 2008 First Quarter Results 18Oncolytics Biotech Inc. Announces 2008 First Quarter Results 19Oncolytics Biotech Inc. Announces 2008 First Quarter Results 20Oncolytics Biotech Inc. Announces 2008 First Quarter Results 21Oncolytics Biotech Inc. Announces 2008 First Quarter Results 22Oncolytics Biotech Inc. Announces 2008 First Quarter Results 23Oncolytics Biotech Inc. Announces 2008 First Quarter Results 24Oncolytics Biotech Inc. Announces 2008 First Quarter Results 25Oncolytics Biotech Inc. Announces 2008 First Quarter Results 26Oncolytics Biotech Inc. Announces 2008 First Quarter Results 27Oncolytics Biotech Inc. Announces 2008 First Quarter Results 28Oncolytics Biotech Inc. Announces 2008 First Quarter Results 29Oncolytics Biotech Inc. Announces 2008 First Quarter Results 30Oncolytics Biotech Inc. Announces 2008 First Quarter Results 31Oncolytics Biotech Inc. Announces 2008 First Quarter Results 32Oncolytics Biotech Inc. Announces 2008 First Quarter Results 33Intervet/Schering-Plough Animal Health Outlines Strength of the Combination 2Intervet/Schering-Plough Animal Health Outlines Strength of the Combination 3Lilly CEO Urges Policy Prescriptions to Help Ensure Public and Private Biotech Investments Generate Dividends and U.S. Job Growth 2
... System provides a simple, rapid and ... glutathione-S-transferase (GST) fusion proteins. Immobilized glutathione ... to isolate GST-tagged protein directly from ... either a manual (requires use of ...
... compact, versatile system that simultaneously harvests and ... microplates into a solid filter supports for ... gamma counter. The FilterMate is ideal for ... as cell proliferation, receptor binding, nucleic acid ...
... based screening project: , 384 ... 96 shape-diverse mixtures of 4 (5 uL each) , ... Individual compounds are dissolved in DMSO at ... Supplied in 5 96-well trays. Dilute library with ...
... Detection Kit (Catalog number SCR004) is a ... assessment of ES cell differentiation by the ... from CHEMICON are the monoclonal antibodies TRA-2-49 ... MAB4354), which permit the detection of Liver ...
Biology Products: