Navigation Links
Fitness for toad sperm: The secret is to mate frequently
Date:12/4/2012

Fertility tests frequently reveal that males have problems with the quality of their sperm. The problems often relate to sperm senescence, which is a reduction in quality with age. Sperm senescence can arise either before or after the DNA in the sperm cells is produced by a process known as meiosis. So-called "pre-meiotic" senescence results from accumulated damage in the germline cells with increasing age and results in older males having sperm of lower quality. Post-meiotic senescence occurs after the sperm cells have been produced, either during storage of sperm by the male or after ejaculation and before they fertilize the eggs.

There is previous evidence that various kinds of sperm senescence occur in insects, in some domestic animals (birds and mammals) and even in humans but the studies have generally been carried out under fairly artificial conditions and so it is not clear how they relate to wild animals or to the general human population. These objections have been overcome in the latest work of Attila Hettyey and colleagues at the Konrad Lorenz Institute of Ethology, University of Veterinary Medicine, Vienna (Vetmeduni), together with Balzs Vgi in Budapest, Hungary, where Hettyey himself is now working.

The researchers investigated the common toad, an interesting model system as it is known to produce all its sperm before the start of the breeding season. They found that male toads that re-entered hibernation at the start of the breeding season, i.e. that lowered their metabolic rates after producing sperm, stored sperm of significantly higher motility than males kept under pseudo-natural conditions without females throughout the entire breeding season. The result means that slowing the normal rate of general physiological processes reduced the normal rate of sperm ageing within the toad's testicles. This constitutes the first evidence for post-meiotic intra-testicular sperm senescence in a wild vertebrate. A further surpri
'/>"/>

Contact: Dr. Richard Wagner
richard.wagner@vetmeduni.ac.at
43-148-909-15831
University of Veterinary Medicine -- Vienna
Source:Eurekalert

Page: 1 2

Related biology news :

1. Green leaf volatiles increase plant fitness via biocontrol
2. Traumatic mating may offer fitness benefits for female sea slugs
3. Iron, vitamins could affect physical fitness in adolescents
4. Cardio fitness levels of breast cancer patients may affect survival
5. Pond skating insects reveal water-walking secrets
6. Biophysicists unravel secrets of genetic switch
7. Ancient genome reveals its secrets
8. New model gives hands-on help for learning the secrets of molecules
9. Decoding the secrets of balance
10. Hidden secrets in the worlds most northerly rainforests
11. Large, medically important class of proteins starts to yield its secrets
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/30/2014)... The Governing Board of the Entomological Society of America ... for 2014. The election as a Fellow acknowledges outstanding ... following: research, teaching, extension, or administration. The following Fellows ... Annual Meeting -- which will be held November 16-19, ... BOSQUE-PREZ is a professor with the Department of ...
(Date:7/30/2014)... Press (OUP) is pleased to announce its new relationship ... 2015, OUP and CINP will partner to publish ... a fully open-access journal. , Alan Frazer, Editor-in-Chief of ... size and expertise of OUP will further facilitate the ... of the very leading journals within neuropsychopharmacology. The conversion ...
(Date:7/30/2014)... of biologists, led by Clemson University associate professor Andrew ... that will pave the way for novel anti-fouling paint ... medical and industrial applications. , The team,s findings, published ... last larval stage of barnacles that attaches to a ... polymeric material that acts as an underwater heavy-duty adhesive. ...
Breaking Biology News(10 mins):Entomological Society of America recognizes 2014 fellows 2Entomological Society of America recognizes 2014 fellows 3Entomological Society of America recognizes 2014 fellows 4Entomological Society of America recognizes 2014 fellows 5Entomological Society of America recognizes 2014 fellows 6Entomological Society of America recognizes 2014 fellows 7Entomological Society of America recognizes 2014 fellows 8Entomological Society of America recognizes 2014 fellows 9Entomological Society of America recognizes 2014 fellows 10Entomological Society of America recognizes 2014 fellows 11Entomological Society of America recognizes 2014 fellows 12Entomological Society of America recognizes 2014 fellows 13Entomological Society of America recognizes 2014 fellows 14Entomological Society of America recognizes 2014 fellows 15Entomological Society of America recognizes 2014 fellows 16Entomological Society of America recognizes 2014 fellows 17OUP to partner with the International College of Neuropsychopharmacology 2Study: Marine pest provides advances in maritime anti-fouling and biomedicine 2
... battle against insect pests, new research indicates that it ... A group of Rockefeller University scientists who had previously ... smell in fruit flies now shows that this gene's ... insect species. , Research by Leslie Vosshall's laboratory had ...
... Researchers at the University of Bath have won a £261,000 ... of a designer drug that could stop influenza and some ... the grant comes at a time when fears are rising ... thousands of people. , Professor Ian Williams, of the Department ...
... researchers present a “cautionary tale?about what may go wrong when ... test for cancer. , In the February 16 issue of ... University of Texas M. D. Anderson Cancer Center detail why ... a small sample of blood is unlikely to lead to ...
Cached Biology News:Ancient olfaction protein is shared by many bugs, offering new pest control target 2Computers to be used to find blueprint for new influenza drug 2New species from old data 2New species from old data 3
(Date:7/30/2014)... July 30, 2014 With the ... of personal health expenditure as well as the ... system, China diagnostic reagent industry has been developing ... 90%. In 2013, Chinese in vitro diagnostics market ... came from in vitro diagnostic reagents. , ...
(Date:7/30/2014)... DIEGO , July 30, 2014  Orexigen Therapeutics, ... has received the Day 180 List of Outstanding Issues ... Products for Human Use (CHMP) for the NB32 Marketing ... bupropion SR) is an investigational drug candidate being evaluated ... the earlier Day 120 time point were adequately addressed ...
(Date:7/30/2014)... , July 30, 2014  RXi ... a biotechnology company focused on discovering, developing ... medical needs using RNA-targeted technologies, today announced ... with RXI-109, for the reduction of recurrence ... surgery, has been initiated. Logo ...
(Date:7/30/2014)... Immunology Summit-2014 will ... Investigators, scientists in the field, which includes prominent ... Case Western Reserve University School of Medicine, USA, ... “The effects of recombinant human IL-6 and ... Arya Biragyn, a Senior investigator at National Institute ...
Breaking Biology Technology:China Diagnostic Reagent Industry Report, 2013-2016 | Researchmoz 2China Diagnostic Reagent Industry Report, 2013-2016 | Researchmoz 3Orexigen Receives CHMP Day 180 List of Outstanding Issues 2Orexigen Receives CHMP Day 180 List of Outstanding Issues 3RXi Pharmaceuticals Expands Clinical Program with Initiation of Third Phase 2a Study with RXI-109 for Treatment of Hypertrophic Scars 2RXi Pharmaceuticals Expands Clinical Program with Initiation of Third Phase 2a Study with RXI-109 for Treatment of Hypertrophic Scars 3RXi Pharmaceuticals Expands Clinical Program with Initiation of Third Phase 2a Study with RXI-109 for Treatment of Hypertrophic Scars 4RXi Pharmaceuticals Expands Clinical Program with Initiation of Third Phase 2a Study with RXI-109 for Treatment of Hypertrophic Scars 5Unveiling Breakthroughs in Clinical & Cellular Immunology 2Unveiling Breakthroughs in Clinical & Cellular Immunology 3
... , EMERYVILLE, Calif. , June 1 Onyx Pharmaceuticals, ... 1 study of ONX 0912, an oral proteasome inhibitor, in patients with ... , , ... program and ONX 0912,s favorable preclinical profile – anti-tumor activity, safety and ...
... ... Consortium Using Systems Biology to Study Infectious Diseases , ... (PRWEB) June 1, 2010 -- Genedata, a leading ... it has been selected to participate in an ERA-Net-funded applied pathogenomics project, which is ...
... ... incorporating BioSoteria’s eLadder® Safety course series into its curriculum. The online drug safety ... pharmacovigilance, accessible to enrolled PharmD and PhD students, postdoctoral fellows, and residents via the ... ...
Cached Biology Technology:Onyx Pharmaceuticals Initiates Phase 1 Study of Oral Proteasome Inhibitor in Advanced Solid Tumors 2Onyx Pharmaceuticals Initiates Phase 1 Study of Oral Proteasome Inhibitor in Advanced Solid Tumors 3Onyx Pharmaceuticals Initiates Phase 1 Study of Oral Proteasome Inhibitor in Advanced Solid Tumors 4Genedata Phylosopher Selected for ERA-NET sncRNA Project 2Genedata Phylosopher Selected for ERA-NET sncRNA Project 3Genedata Phylosopher Selected for ERA-NET sncRNA Project 4University of Maryland School of Pharmacy Adopts BioSoteria's eLearning Drug Safety Courses 2University of Maryland School of Pharmacy Adopts BioSoteria's eLearning Drug Safety Courses 3University of Maryland School of Pharmacy Adopts BioSoteria's eLearning Drug Safety Courses 4
... Apoptosis is an evolutionarily conserved form ... cellular process. The central component of ... enzymes called caspases. These enzymes participate ... triggered in response to pro-apoptotic signals and ...
... DNA Visualizer Extraction Kit is manufactured for ... DNA damage byexposure to UV light. The ... is often used for DNA-cloning work. The ... bromide and exposure of UV light damages ...
... System provides optimized reagents and protocols for ... genes by insertion of group II introns. ... group II introns and utilizes a simple ... II intron for specific insertion into the ...
Mouse monoclonal antibody raised against a partial recombinant VRK2. NCBI Entrez Gene ID = VRK2...
Biology Products: