Navigation Links
Mothers give interloper's offspring a head start in life
Date:5/14/2009

ays, with the order of hatching closely reflecting the order of laying," said Dr Magrath.

"Consequently, extra-pair chicks ended up hatched almost 10 hours before their within-pair half-siblings, on average, allowing them to gain an initial size advantage because parents start feeding chicks as soon as they hatch."

Because of this early advantage, extra-pair chicks were more likely to survive and were also larger than their within-pair half-siblings by the time they left the nest. However, after correcting for variation in hatching time, the researchers found that all differences between extra-pair and within-pair chicks were reduced or absent, indicating that this non-genetic, laying order effect largely accounted for the observed superiority of the extra-pair offspring.

The next challenge for the team is to understand why there is a connection between paternity and the laying order of eggs in the first place.

"Genetic testing now allows us to determine the paternity of individual chicks in mixed broods, but we still don't understand why extra-pair offspring are laid earlier or even why females choose to mate with extra-pair males," said Dr Magrath.

One explanation could be in the timing of copulations. Females may engage in extra-pair matings to guard against the possibility that their social partner is infertile.

"Because females can often store sperm for several weeks, they may typically only copulate with extra-pair males before the start of laying as this may be adequate to fertilise all eggs in the clutch in the event of pair male infertility. However, in the vast majority of cases the pair male is fertile and this scenario could explain why extra-pair offspring become less likely among later laid eggs."

Even if females obtain a mix of sperm before laying, it is possible that the sperm from extra-pair males is more successful in fertilizing eggs if it is of higher quality (e.g. swims faster),
'/>"/>

Contact: Nerissa Hannink
nhannink@unimelb.edu.au
61-383-448-151
University of Melbourne
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. Safer, more accurate radiation therapy for expecting mothers
2. Hungry mothers risk addiction in their adult children
3. Negligent, attentive mouse mothers show biological differences
4. Too much or too little weight gain poses risks to pregnant mothers, babies
5. Mice mothers devote energies to offspring when life is threatened
6. Vitamin D deficiency in infants and nursing mothers carries long-term disease risks
7. Mothers pass on disease clues to offspring
8. Facebook flack regarding breastfeeding mothers
9. Older killer whales make the best mothers
10. Mothers of multiple births at increased odds of postpartum depression
11. Species still have more viable offspring if they can choose their best mate
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/23/2015)... , July 23, 2015 Research and ... of the "Global Outlook of the Biometrics ... The global biometrics market is ... and commercial applications owing to the uptake of ... a transformation that enhances the growth of biometrics ...
(Date:7/20/2015)... , July 20, 2015  Acuity Market Intelligence,s ... The Convergence of Commerce and Privacy" forecasts that ... biometric apps will be downloaded to smart mobile ... mobile biometrics market is projected to generate more ... during the seven-year forecast period.    ...
(Date:7/9/2015)... , July 07, 2015 ... announced the addition of the "Biometrics for ... Forecasts 2015-2020" report to their offering. ... major contributor to this growth and the forecast ... billion in revenue for companies involved in delivering ...
Breaking Biology News(10 mins):Global Outlook of the Biometrics Industry 2015 2Global Outlook of the Biometrics Industry 2015 3Biometrics on Smart Mobile Devices to Redefine Digital Identity with 12.9 Billion Biometric App Downloads between 2014 and 2020 2Global Banking Biometrics Market 2015-2020 - Market & Technology Analysis, Adoption Strategies and Forecasts 2Global Banking Biometrics Market 2015-2020 - Market & Technology Analysis, Adoption Strategies and Forecasts 3
... has provided the first detailed look at the internal head ... fossil animal that represents an important intermediate step in the ... Results of the study, published in this week,s issue ... from aquatic to terrestrial lifestyle involved complex changes not only ...
... dine on fish, shrimp, and mollusks, they are ... New genetic research carried out by Eugenia Naro-Maciel, ... Biodiversity and Conservation at the American Museum of ... the evolutionary relationships among all seven sea turtle ...
... of cells can be detected in a mineral likely ... obtained using a technique developed at the U.S. Department ... choose Martian surface samples with the most promise for ... tiny bits of mineral and looks for chemical signatures ...
Cached Biology News:Details of evolutionary transition from fish to land animals revealed 2Revealing the evolutionary history of threatened sea turtles 2Sensitive laser instrument could aid search for life on Mars 2Sensitive laser instrument could aid search for life on Mars 3
(Date:7/30/2015)... San Diego , CA (PRWEB) , ... July ... ... Biopharma, announced the successful completion of a field clinical study of its canine ... being developed together with Aratana Therapeutics (Kansas City, KS) and will be marketed ...
(Date:7/30/2015)... Denmark , July 30, 2015 ... biotechnology company that applies its innovative TransCon technology ... positive top-line results from a six-month Phase 2 ... once-weekly TransCon Growth Hormone in 53 treatment-naïve, pre-pubertal ... "We are extremely pleased with the top-line ...
(Date:7/30/2015)... Bedford, NH (PRWEB) , ... July 30, 2015 ... ... efficiency homogenizer for advanced fluid applications and designed for continuous operation up to ... clean-in-place and sterilization-in-place, ensuring safety, efficiency, and preventing toxic contamination. , The Pony™ ...
(Date:7/29/2015)... SYDNEY , July 29, 2015 US-Australian ... NVGN ) today confirmed it is committed to progressing ... as soon as practicable and to ensure the Company ... Chief Executive Officer, Iain Ross , said the ... including the lead pre-clinical programs, discovery programs and academic ...
Breaking Biology Technology:VetStem Biopharma Successfully Completes Large Milestone Efficacy Study for its Flagship Canine Osteoarthritis Stem Cell Product 2VetStem Biopharma Successfully Completes Large Milestone Efficacy Study for its Flagship Canine Osteoarthritis Stem Cell Product 3Ascendis Pharma A/S Announces Positive Top-line Results from a Phase 2 Pediatric Study of Once-Weekly TransCon Growth Hormone for the Treatment of Growth Hormone Deficiency 2Ascendis Pharma A/S Announces Positive Top-line Results from a Phase 2 Pediatric Study of Once-Weekly TransCon Growth Hormone for the Treatment of Growth Hormone Deficiency 3Ascendis Pharma A/S Announces Positive Top-line Results from a Phase 2 Pediatric Study of Once-Weekly TransCon Growth Hormone for the Treatment of Growth Hormone Deficiency 4Ascendis Pharma A/S Announces Positive Top-line Results from a Phase 2 Pediatric Study of Once-Weekly TransCon Growth Hormone for the Treatment of Growth Hormone Deficiency 5Ascendis Pharma A/S Announces Positive Top-line Results from a Phase 2 Pediatric Study of Once-Weekly TransCon Growth Hormone for the Treatment of Growth Hormone Deficiency 6Ascendis Pharma A/S Announces Positive Top-line Results from a Phase 2 Pediatric Study of Once-Weekly TransCon Growth Hormone for the Treatment of Growth Hormone Deficiency 7GEA Announces the Pony™ NS2006L… a Self-contained, High Pressure Lab Homogenizer for Product Development Ensuring Maximum Efficiency and Safety 2Newly Appointed Acting CEO Outlines Immediate Plans for Novogen 2Newly Appointed Acting CEO Outlines Immediate Plans for Novogen 3Newly Appointed Acting CEO Outlines Immediate Plans for Novogen 4Newly Appointed Acting CEO Outlines Immediate Plans for Novogen 5Newly Appointed Acting CEO Outlines Immediate Plans for Novogen 6Newly Appointed Acting CEO Outlines Immediate Plans for Novogen 7Newly Appointed Acting CEO Outlines Immediate Plans for Novogen 8Newly Appointed Acting CEO Outlines Immediate Plans for Novogen 9Newly Appointed Acting CEO Outlines Immediate Plans for Novogen 10
... Sangamo BioSciences, Inc. (Nasdaq: SGMO ) announced ... an update on the progress of Sangamo,s ZFP Therapeutic® development ... 11:00 am ET on Tuesday, November 15, 2011 at the ... held in New York City. The presentation will ...
... Nov. 8, 2011 Accuray Incorporated (Nasdaq: ARAY), ... today financial results for the first quarter of fiscal ... June 10, 2011, Accuray completed the acquisition of TomoTherapy. ... reflect the consolidation of both Accuray and TomoTherapy.  Non-GAAP ...
... Santo VC GmbH has acquired a EUR 20 ... has also secured an option for further capital increases in ... increased its existing investment in AFFiRiS by EUR 5 million ... has an additional EUR 25 million in   equity at ...
Cached Biology Technology:Sangamo BioSciences Announces Presentation at the Lazard Capital Markets 8th Annual Healthcare Conference 2Accuray Announces Results for First Quarter Fiscal 2012 2Accuray Announces Results for First Quarter Fiscal 2012 3Accuray Announces Results for First Quarter Fiscal 2012 4Accuray Announces Results for First Quarter Fiscal 2012 5Accuray Announces Results for First Quarter Fiscal 2012 6Accuray Announces Results for First Quarter Fiscal 2012 7Accuray Announces Results for First Quarter Fiscal 2012 8Accuray Announces Results for First Quarter Fiscal 2012 9Accuray Announces Results for First Quarter Fiscal 2012 10Accuray Announces Results for First Quarter Fiscal 2012 11AFFiRiS AG: Capital Increase: AFFiRiS Brings Santo VC and MIG 11 on Board 2AFFiRiS AG: Capital Increase: AFFiRiS Brings Santo VC and MIG 11 on Board 3AFFiRiS AG: Capital Increase: AFFiRiS Brings Santo VC and MIG 11 on Board 4
...
Mouse Cell Line Slides...
Human Cell Line Slides...
... Detection System combines the indirect labeling ... and Signets unique formulation of ultra ... reliablility. Signet reagents will achieve excellent ... automated protocols. ,Signets USA Detection reagents ...
Biology Products: