Navigation Links
Hormones dictate breeding success in birds
Date:1/26/2011

tive success. These birds often differ significantly in terms of the number of clutches they produce, the number of eggs they lay over the course of a breeding season and how many of their young become fully fledged. Because house sparrows are faithful to their habitats, very specific studies can be carried out on individual birds over an extended period.

The scientists counted the number of eggs, clutches and fledglings for each breeding pair. They also took regular blood samples three weeks before the beginning of breeding and during the rearing of the first clutch, both in natural situations and under artificially generated stress, to determine the corresponding concentrations of the hormones corticosterone and prolactin in the birds' blood. "We were surprised that we could predict how many offspring a breeding pair would have based on hormone levels three weeks before the breeding season," reports Jenny Ouyang. "Sparrows that had low corticosterone values before the breeding season raised the most offspring. Especially birds with low values before, but high values during the season had the highest reproductive success. They apparently invested a lot of energy in the brood." In contrast, the animals that had a very strong hormonal reaction to stress fed their young less and produced fewer offspring.

According to the scientists, prolactin plays a crucial role in the timing of laying the first egg: females with higher prolactin levels started laying earlier and had more offspring as a result. "The fact that the two parents have very similar hormonal values is also fascinating for us," adds Jenny Ouyang. "It is not yet clear whether the couples influence each other's hormonal status or whether they select partners with similar hormone levels."

The results of this study enhance knowledge about the physiological mechanisms that can dictate when a bird breeds, how many eggs it produces per clutch and how often it breeds. The hormones prolact
'/>"/>

Contact: Jenny Ouyang
jqouyang@gmail.com
805-703-01712
Max-Planck-Gesellschaft
Source:Eurekalert  

Page: 1 2 3

Related medicine news :

1. Crucial sex hormones re-routed by missing molecule
2. Study finds why some women are sub-fertile with a poor response to ovarian stimulating hormones
3. Upcoming Simulcast to Teach Women How to Lose Weight and Naturally Balance Hormones with Polycystic Ovarian Syndrome
4. Women with Polycystic Ovarian Syndrome and Insulin Resistance can Lose Weight and Balance Hormones Naturally with Katie Humphrey's New E-book
5. Male sex hormones in ovaries essential for female fertility
6. Hormones Tied to Diabetes Might Also Influence Fertility
7. Anti-aging hormones: Little or no benefit and the risks are high
8. Demonstrated in vivo the transfer of maternal thyroid hormones to the fetus
9. Novel soy germ-based dietary supplement, SE5-OH containing natural S-Equol, examined for safety and influence on hormones in pre- and post-menopausal women
10. Transcription factors may dictate differences between individuals
11. Self-Control Could Turn Kids Into Successful Adults
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Hormones dictate breeding success in birds
(Date:7/30/2014)... (PRWEB) July 30, 2014 Conducting ... Advanced Critical Thinking Skills and Innovative Techniques to ... Immel Resources and FDAnews**, Sept. 17-18, 2014 – ... been the #1 reason for 483 observations since ... clear: Developing a successful CAPA program has never ...
(Date:7/30/2014)... Good Neighbor Community Services announced ... episode of Innovations with Ed Begley Jr, airing ... show times TBA. , In this segment, viewers ... vision to redefine the traditional approach to serving ... Through passion, innovation, determination, excellence, and collaboration, Good ...
(Date:7/30/2014)... CA (PRWEB) July 30, 2014 SF ... accessories at the lowest prices on the internet with ... Cables in two lengths and two colors. These lightning ... standards. , The high quality SF Cable ... connector with digital signal delivering faster charging and syncing. ...
(Date:7/30/2014)... July 30, 2014 Hamilton Facial ... of its new Carmel office on July 30th. After ... finally be moving to the state-of-the-art suite, located only ... innovative space will allow for one-on-one patient comfort, shorter ... experience. , Dr. Hamilton’s new office-suite will continue ...
(Date:7/30/2014)... ... ... ... , ... , For the study, published this week in the peer-reviewed journal Quality of Life Research , a UCLA team led by ...
Breaking Medicine News(10 mins):Health News:FDAnews Workshop: Conducting Advanced Root Cause Analysis CAPA Investigations, Sept. 17-18, 2014, Raleigh, NC 2Health News:FDAnews Workshop: Conducting Advanced Root Cause Analysis CAPA Investigations, Sept. 17-18, 2014, Raleigh, NC 3Health News:FDAnews Workshop: Conducting Advanced Root Cause Analysis CAPA Investigations, Sept. 17-18, 2014, Raleigh, NC 4Health News:Good Neighbor Community Services to be Featured in an Upcoming Episode of Innovations With Ed Begley, Jr. 2Health News:SF Cable Delivers Certified Lightning Cable in Multiple Sizes and Colors 2Health News:Hamilton Facial Plastic Surgery Opens New Carmel Office 2Health News:Diverticulitis patients reveal psychological, physical symptoms long after acute attacks 2Health News:Diverticulitis patients reveal psychological, physical symptoms long after acute attacks 3
... OSLO, June 24 DiaGenic ASA (OSL: ... with Merz Pharmaceuticals,GmbH, an innovative developer of drugs for ... to biomarkers for Mild Cognitive,Impairment (MCI), increasingly considered a ... be used to identify patients with MCI,prone to converting ...
... ... most individuals know the importance of applying sunscreen regularly, but in a recent literature study ... be even more at risk for developing the deadly disease. , ... Rosemont, IL (Vocus) June 24, 2009 -- With ...
... ... prevention for at-risk horses. , ... Shenandoah, IA (PRWEB) June 24, 2009 -- Equine obesity is on the rise in the ... at a higher risk for laminitis: a debilitating condition responsible for thousands of deaths each ...
... ... sample and learn about their new products at the ASMBS conference. The Company located in ... ... Advantage, a Division of Catalina Lifesciences, could barely keep up with demand to sample and ...
... Cytox Limited, a UK-based neuroscience company that provides ... disease (AD) clinical trials, has announced completion of a ... million). , , Proceeds will be used ... AD and mild cognitive impairment (MCI). Cytox,s biomarkers help ...
... at greater risk of heart-rhythm abnormality: study , TUESDAY, ... severe sleep-related breathing problems are at increased risk for ... study included 2,911 men who underwent sleep testing between ... paused or shallow breathing during sleep were more likely ...
Cached Medicine News:Health News:DiaGenic to Provide MCI Biomarkers for Merz Pharmaceuticals 2Health News:DiaGenic to Provide MCI Biomarkers for Merz Pharmaceuticals 3Health News:Study Finds Skin Cancer Rates Higher Among Athletes 2Health News:Equine Obesity is Associated with Significant Health Issues, Including Insulin Resistance and Laminitis 2Health News:Interest in the Bariatric Advantage Chewy Bites and Other New Products is at an All-Time High at the ASMBS Conference 2Health News:Cytox Raises Pre-Series A Financing From Management and Existing UK Investors, Welcomes First US Investors 2Health News:Cytox Raises Pre-Series A Financing From Management and Existing UK Investors, Welcomes First US Investors 3Health News:Cytox Raises Pre-Series A Financing From Management and Existing UK Investors, Welcomes First US Investors 4Health News:Sleep Disorders Linked to Arrhythmias 2
(Date:7/30/2014)... SAN DIEGO , July 30, 2014  Eisai Inc. ... today that an article based on post-hoc analyses from the ... Loss While on Lorcaserin, Diet, and Exercise as a Predictor ... online issue of Obesity , the official peer reviewed ... was to identify whether there is an early treatment milestone ...
(Date:7/30/2014)... 2014 /PRNewswire-iReach/ -- This is a professional and ... sodium (CAS 9041-08-1) & calcium (CAS 37270-89-6) industry. ... Heparin sodium (CAS 9041-08-1) & calcium (CAS 37270-89-6) ... report then explores global and China,s top manufacturers ... 37270-89-6) listing their product specification, capacity, production value, ...
(Date:7/30/2014)... July 30, 2014   Epic Sciences, Inc. ... designs and develops novel diagnostics to personalize and ... today the completion of a $30 million Series ... investors RusnanoMedInvest (RMI) and Arcus Ventures, existing investors ... Investments, as well as undisclosed individual investors. With ...
Breaking Medicine Technology:Eisai and Arena Pharmaceuticals Announce Publication of Post-Hoc Analyses of Lorcaserin Phase 3 Clinical Trial Results in Obesity 2Eisai and Arena Pharmaceuticals Announce Publication of Post-Hoc Analyses of Lorcaserin Phase 3 Clinical Trial Results in Obesity 3Eisai and Arena Pharmaceuticals Announce Publication of Post-Hoc Analyses of Lorcaserin Phase 3 Clinical Trial Results in Obesity 4Eisai and Arena Pharmaceuticals Announce Publication of Post-Hoc Analyses of Lorcaserin Phase 3 Clinical Trial Results in Obesity 5Eisai and Arena Pharmaceuticals Announce Publication of Post-Hoc Analyses of Lorcaserin Phase 3 Clinical Trial Results in Obesity 6Eisai and Arena Pharmaceuticals Announce Publication of Post-Hoc Analyses of Lorcaserin Phase 3 Clinical Trial Results in Obesity 7Heparin Sodium & Calcium Industry for Global and Chinese Markets Forecast to 2019 2Heparin Sodium & Calcium Industry for Global and Chinese Markets Forecast to 2019 3Heparin Sodium & Calcium Industry for Global and Chinese Markets Forecast to 2019 4Heparin Sodium & Calcium Industry for Global and Chinese Markets Forecast to 2019 5Epic Sciences Announces Series C Financing to Advance Essential Cancer Diagnostics for Personalized Medicine 2Epic Sciences Announces Series C Financing to Advance Essential Cancer Diagnostics for Personalized Medicine 3
... is a national reference laboratory and a ... development. ARUP offers an extensive test menu ... in clinical and anatomic pathology. Owned by ... include more than half of the nation's ...
... ARUP Laboratories is a national reference ... laboratory research and development. ARUP offers an ... unique medical tests in clinical and anatomic ... ARUP Laboratories' clients include more than half ...
... national reference laboratory and a worldwide leader ... offers an extensive test menu of highly ... and anatomic pathology. Owned by the University ... than half of the nation's university teaching ...
... is a national reference laboratory and a ... development. ARUP offers an extensive test menu ... in clinical and anatomic pathology. Owned by ... include more than half of the nation's ...
Medicine Products: