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:8/31/2015)... 2015 Growing need for data ... digitization projects to drive India biometrics ... Research report, " India Biometrics Market Forecast & Opportunities, 2020 ... projected to grow at a CAGR of over 35% during ... account of extensive use of biometric technology in the government ...
(Date:8/25/2015)... BELLEVUE, Wash. , Aug. 25, 2015 ... systems, announced today it will unveil its "Guardian S" ... at the National Tactical Officers Association Conference on August ... Guardian S is the first-ever commercially available energetically autonomous ... research and in-field trials and is protected by more ...
(Date:8/20/2015)... , Aug. 20, 2015   Sensory, Inc ... improving the user experience and security of consumer ... today announced that its TrulySecure™ is ... software to be FIDO Certified™. The ... compliance with the FIDO UAF (Universal Authentication Framework) ...
Breaking Biology News(10 mins):India Biometrics Market to Grow at Over 35% Through 2020, Says TechSci Research 2India Biometrics Market to Grow at Over 35% Through 2020, Says TechSci Research 3Sarcos to Debut First-of-its-Kind Snake Robot 2Sarcos to Debut First-of-its-Kind Snake Robot 3TrulySecure From Sensory Becomes First Face and Voice Biometrics Technology to be FIDO UAF Certified 2TrulySecure From Sensory Becomes First Face and Voice Biometrics Technology to be FIDO UAF Certified 3TrulySecure From Sensory Becomes First Face and Voice Biometrics Technology to be FIDO UAF Certified 4TrulySecure From Sensory Becomes First Face and Voice Biometrics Technology to be FIDO UAF Certified 5
... , , , , , ... AUDIO: When soldiers leave base for a three-day mission, how much water should they bring? Dr. Samuel Cheuvront of ... here for more information. , , , , ... , , , , , , ...
... of plant proteins that "shut the door" on bacteria that ... the first time by a team of researchers in Denmark, ... Findings from the study, which will appear June 29 ... , provide a better understanding of plants, immune systems and ...
... plants using a new type of genetic modification (GM), bringing ... research team based at the University of Adelaide,s Waite ... to contain salt in parts of the plant where it ... the results of this research could impact on world food ...
Cached Biology News:Army study improves ability to predict drinking water needs 2Army study improves ability to predict drinking water needs 3Army study improves ability to predict drinking water needs 4Army study improves ability to predict drinking water needs 5Plant protein 'doorkeepers' block invading microbes, study finds 2Plant protein 'doorkeepers' block invading microbes, study finds 3Scientists closer to developing salt-tolerant crops 2
(Date:9/3/2015)... ... ... Park Systems announced that they will host a free webinar ... webinar will focus on the methods and materials for additive manufacturing – beyond their ... broad term that encompasses “addition or fusion” of materials to create an object. This ...
(Date:9/2/2015)... Sept. 2, 2015 Axovant Sciences Ltd. (NYSE:  AXON), ... dementia, today announced upcoming presentations at three investor conferences: ... Baird 2015 Healthcare Conference in New York ... September 10 at 2:00 PM at the BioCentury NewsMakers Conference ... Broadway Hotel & Conference Center , Thursday, September 17 ...
(Date:9/2/2015)... Research and Markets ... Jain PharmaBiotech,s new report "DNA Sequencing - ... This report briefly reviews basics of ... their applications. Current large and small sequencers are ... applications of sequencing are described including those for ...
(Date:9/2/2015)... 02, 2015 Research ... addition of Jain PharmaBiotech,s new report "Biomarkers ... offering. This report follows the broad ... can be objectively measured and evaluated as an ... well as pharmacological responses to a therapeutic intervention. ...
Breaking Biology Technology:Park Systems Announces Webinar on 3D Printing and Additive Manufacturing for Nano-Scientists, Researchers in Nanotechnology and Engineers 2Park Systems Announces Webinar on 3D Printing and Additive Manufacturing for Nano-Scientists, Researchers in Nanotechnology and Engineers 3Park Systems Announces Webinar on 3D Printing and Additive Manufacturing for Nano-Scientists, Researchers in Nanotechnology and Engineers 4Axovant Sciences To Present At Upcoming Investor Conferences 2Axovant Sciences To Present At Upcoming Investor Conferences 3Global DNA Sequencing Technologies Report 2015: Profiles of 130 Companies Involved in Sequencing and their 140 Collaborations 2Updated 2015 Biomarkers Report - Latest Technologies, Markets and Companies Insights to 2024 with over 1,000 References 2Updated 2015 Biomarkers Report - Latest Technologies, Markets and Companies Insights to 2024 with over 1,000 References 3
... by University of Wisconsin Chancellor John Wiley along with ... support for the continued growth and development of Wisconsin ... special meeting of the Wisconsin Biotechnology Association, proclaimed his ... I will veto any legislation that will prohibit research ...
... years ago, but he hasn't given up preaching. , ... all things Internet spotlights old ways of thinking and ... requirement is to be willing to become conscious and truly ... that prevent us from encouraging, supporting, and sustaining innovative and ...
... the state will soon be able to benefit ... Manufacturing Extension Partnership (WMEP) and the University of ... will bring e-business technologies to local manufacturers. , ... chain collaboration among manufacturers and suppliers is the ...
Cached Biology Technology:Governor Doyle Pledges Support for Stem Cell Research and Biotechnology Advancements 2Dream Thieme 2Alliance Brings E-Business Technologies to Wisconsin Manufacturers 2
Rabbit polyclonal antibody to GluR2...
...
... sufficient materials for 1,464 array sample elements. , , ... , Blocker BSA in PBS (10X): 50 ml ... BupH Phosphate Buffered Saline: 8 packs , 10% ... Pico Luminol Enhancer: 2 x 25 ml , SuperSignal ...
... platform provides excellent performance, reliability and ... format applications, including washing of ELISAs, ... vacuum filtration-to-waste, such as for PCR ... features set new standards for plate ...
Biology Products: