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:4/1/2015)... , April 1, 2015   Medisafe ™, the ... users across iOS and Android ... integrating biofeedback into the platform to allow patients to ... For the first time, patients will be able to ... dose impacts important biometrics, such as glucose levels and ...
(Date:3/31/2015)... --  Guidepoint , a leading global research services firm, ... TRACKER, part of the Guidepoint TRACKER suite ... device and therapeutics markets. The Post-Surgical Pain Management TRACKER ... share, and adoption rates across three major modalities used ... The Post-Surgical Pain Management TRACKER will provide length ...
(Date:3/26/2015)... TORONTO , March 26, 2015 ... premier family, social, recreation and athletic club, today announced ... designed to allow freedom of movement for members and ... "Following a comprehensive process, we selected FST,s IMID ... sophistication and convenience for our members and staff, in ...
Breaking Biology News(10 mins):Medisafe Announces Launch of Biometric Integration, Enabling Patients to Stay Adherent to Their Meds and See Tangible Health Results 2Guidepoint Launches Post-Surgical Pain Management TRACKER 2Guidepoint Launches Post-Surgical Pain Management TRACKER 3Granite Club First Private Club in North America to Implement FST Biometrics Secure Access Solution, as Part of Multi-million Dollar Expansion 2
... hard to come by, a University of Central Florida and ... National Institutes of Health highly competitive grants for hemophilia research. ... is aimed at determining whether a green technique pioneered at ... The second grant worth $2 million for four years is ...
... The Newark College of Engineering (NCE) at NJIT has been ... one of 20 universities and colleges across the nation in ... programs. This selection is the culmination of a ... Associate Dean Lisa Axe. Currently, some 43 percent ...
... out of the lab for a test drive with ... new way to develop possible future scenarios. James ... Center for Systems Integration and Sustainability (CSIS) and now ... London, has paired the relatively new use of agent-based ...
Cached Biology News:Hemophilia research gets NIH boost to a tune of $5.5 million 2Hemophilia research gets NIH boost to a tune of $5.5 million 3NSF funds NJIT's participation in program to retain engineering students 2Engaging land-use stakeholders is model behavior 2
(Date:4/24/2015)... 2015 PAREXEL International Corporation (NASDAQ: PRXL ... that Partnerships in Clinical Trials named PAREXEL,s Drew ... Innovator of the Year.  The honor recognizes Mr. Garty,s ... Perceptive MyTrials ® Data-Driven Monitoring solution. ... 2015 Partnership Awards in Boston , ...
(Date:4/23/2015)... April 23, 2015 /CNW/ - A new and innovative ... from North America,s largest ... won Silver in the "Sustainability, service" category of ... Brandcheck "Competitor Comparison" is a service that scores ... and Global peers. This benchmarking process shows clients ...
(Date:4/23/2015)... San Jose, California (PRWEB) April 23, 2015 ... – Predictive diagnostics refer to a series of ... such as cystic fibrosis, Lou Gehrig's disease, Huntington's ... beneficial in examining the gene composition and interaction ... of the disease as well as the response ...
(Date:4/23/2015)... Irvine, CA (PRWEB) April 23, 2015 ... research leader in Personalized Medicine, is excited to ... Medication Response profile . This profile assesses 62 ... and provide dosing information for commonly prescribed non-opioid ... gabapentin (brand name Neurontin), alprazolam (brand name Xanax) ...
Breaking Biology Technology:PAREXEL Honored With 2015 Clinical Innovator Of The Year Award From Partnerships In Clinical Trials 2PAREXEL Honored With 2015 Clinical Innovator Of The Year Award From Partnerships In Clinical Trials 3PAREXEL Honored With 2015 Clinical Innovator Of The Year Award From Partnerships In Clinical Trials 4PAREXEL Honored With 2015 Clinical Innovator Of The Year Award From Partnerships In Clinical Trials 5Increasing Disease Prevalence & Focus on Preventive Healthcare Drive the Predictive Diagnostics Market, According to a New Report by Global Industry Analysts, Inc. 2Increasing Disease Prevalence & Focus on Preventive Healthcare Drive the Predictive Diagnostics Market, According to a New Report by Global Industry Analysts, Inc. 3Proove Biosciences Launches World’s First Test to Predict Responders to Commonly Prescribed Non-Opioid Pain Medications 2Proove Biosciences Launches World’s First Test to Predict Responders to Commonly Prescribed Non-Opioid Pain Medications 3
... Palatin Technologies,Inc. (Amex: PTN ) will announce ... 9, 2007 before the open of the U.S. financial,markets. ... live audio webcast,hosted by Palatin,s executive management team on ... of operations in greater detail and provide,an update on ...
... 5 Exelixis,Inc. (Nasdaq: EXEL ) today ... 30, 2007. Revenues for the quarter ended ... million for the comparable period in 2006. The ... due to revenue recognition,associated with new collaboration agreements ...
... patients in over 30 states on ... options since 1997, DEERFIELD, Ill., Nov. 5 ... Kidney Patient,Educator (KPE) program, an ambitious project that has ... treatment options to,nearly 80,000 kidney disease patients in over ...
Cached Biology Technology:Palatin Technologies to Report Fiscal Year 2008 First Quarter Results; Teleconference and Webcast on November 9, 2007 2Exelixis Announces Third Quarter 2007 Financial Results and Business Update 2Exelixis Announces Third Quarter 2007 Financial Results and Business Update 3Exelixis Announces Third Quarter 2007 Financial Results and Business Update 4Exelixis Announces Third Quarter 2007 Financial Results and Business Update 5Exelixis Announces Third Quarter 2007 Financial Results and Business Update 6Exelixis Announces Third Quarter 2007 Financial Results and Business Update 7Exelixis Announces Third Quarter 2007 Financial Results and Business Update 8Baxter Kidney Patient Education Program Celebrates Tenth Anniversary 2Baxter Kidney Patient Education Program Celebrates Tenth Anniversary 3Baxter Kidney Patient Education Program Celebrates Tenth Anniversary 4
Adjustable tilt angle 0 to 20 Adjustable speed of 3-25 RPM Load capacity: 2.7 kg (6 lbs.) Ambient temperature range 4C to 65C Low voltage power is supplied by wall mount transformer...
Request Info...
... the rapid isolation of DNA from high melt ... the spin filter, centrifuge for 3 minutes, and ... is no need to melt agarose or use ... be used for buffer exchange, primer removal from ...
Request Info...
Biology Products: