HOME >> BIOLOGY >> NEWS
Italian research reveals a new twist in the battle of the sexes

New research from Italy reveals that mother nature tries very hard to compensate for the fact that male foetuses and newborns are more fragile than females by allowing significantly more boys to be conceived at a time of year when conditions for pregnancy and birth are optimal.

Evidence that males are more fragile than females and that fewer males are conceived in sub-optimal conditions is not new. What is new in research published (Thursday 27 March) in Human Reproduction[1] is the extent to which nature tries to level the playing field to give boys a sporting chance.

In the first study designed specifically to focus on sex ratio (the proportion of boys to girls) at conception as opposed to at birth[2] Dr Angelo Cagnacci and his team from the gynaecology unit at the Policlinico of Modena found that 535 males were conceived in the 'best' month for conception as against 465 females, while only 487 males were conceived for 513 females in the 'worst' month[3]. (The normal sex ratio is 511 males to 489 females out of every 1,000 conceptions that produce a birth).

Dr Cagnacci explained that seasonal variations in reproduction have been described before, and a higher conception rate should indicate conditions more favourable for pregnancy and newborn survival for both boys and girls. This seasonal variation is different in different latitudes because it is linked to the length of daytime hours and environmental temperature. Optimum conditions are daytime of 12 hours and a mean temperature of 12C, so maximum conception rates occur at opposite times in regions equidistant from the equator but located in different hemispheres.

"In this study of over 14,000 births at our institute over a six year period, the lowest conception rates were from March to May and the highest from September to November. What is fascinating is the degree of disparity in sex ratio that the numbers of boys conceived compared with girls was so much higher in the favou
'"/>

Contact: Margaret Willson
m.willson@mwcommunications.org.uk
44-1536-772181
European Society for Human Reproduction and Embryology
26-Mar-2003


Page: 1 2 3

Related biology news :

1. Italian research links diet with endometriosis risk
2. Researchers say US military accidentally introduced tree pathogen to Italian estate
3. Italian study finds traffic pollution affects male fertility
4. European experts slam new Italian fertility proposals
5. Italian wolves havent gone to the dogs--yet
6. Leader in cancer treatment and prevention research honored
7. UT Southwestern receives $1.78 million grant for obesity research as part of NIH Roadmap initiative
8. Scientists to prototype cyberinfrastructure for research and education access to ocean observatories
9. Belgian researchers explore revolutionary approach to angiogenesis
10. Award winning researchers reveal potential new role for Glivec
11. New research shows plants can shuffle and paste gene pieces to generate genetic diversity

Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Italian research reveals new twist the battle the sexes

(Date:8/4/2015)... ) today reported financial and operating results for the second quarter ... quarter contract revenue of $ 85.2 million, a ... of 26 % , Second quarter adjusted ... royalties in the current quarter , Operating cash ... to present another strong financial quarter, with all our divisions achieving ...
(Date:7/31/2015)... -- Den 10. internationale konference om Genomik (ICG-10, ... 25. oktober i Shenzhen , Kina. ... år. Siden starten i 2006 er ICB blevet en ... er en af de mest dynamiske, entusiastiske og sjove ... gennembrud og fremskridt inden for ,omik,-forskning, som yderligere vil ...
(Date:7/31/2015)... SHENZHEN, China , 31 de julho de 2015 ... Genômica (ICG-10, www.icg-10.org ) será realizada pela BGI de ... China . A conferência está ... inauguração em 2006, a ICG se tornou uma das ... e um dos encontros científicos mais dinâmicos, entusiastas e ...
Breaking Biology News(10 mins):AMRI Announces Second Quarter 2015 Results 2AMRI Announces Second Quarter 2015 Results 3AMRI Announces Second Quarter 2015 Results 4AMRI Announces Second Quarter 2015 Results 5AMRI Announces Second Quarter 2015 Results 6AMRI Announces Second Quarter 2015 Results 7AMRI Announces Second Quarter 2015 Results 8AMRI Announces Second Quarter 2015 Results 9AMRI Announces Second Quarter 2015 Results 10AMRI Announces Second Quarter 2015 Results 11AMRI Announces Second Quarter 2015 Results 12AMRI Announces Second Quarter 2015 Results 13AMRI Announces Second Quarter 2015 Results 14AMRI Announces Second Quarter 2015 Results 15AMRI Announces Second Quarter 2015 Results 16AMRI Announces Second Quarter 2015 Results 17AMRI Announces Second Quarter 2015 Results 18AMRI Announces Second Quarter 2015 Results 19AMRI Announces Second Quarter 2015 Results 20AMRI Announces Second Quarter 2015 Results 21AMRI Announces Second Quarter 2015 Results 22AMRI Announces Second Quarter 2015 Results 23AMRI Announces Second Quarter 2015 Results 24Den 10. internationale konference om Genomics (ICG-10) åbner i oktober 2A 10a. Conferência Internacional sobre Genômica (ICG-10) será em outubro 2A 10a. Conferência Internacional sobre Genômica (ICG-10) será em outubro 3
(Date:8/31/2015)... -- US-Australian drug discovery company, Novogen Limited (ASX: NRT; ... scientific review has identified high value opportunities for ... patient need. Novogen is moving as quickly as ... entering into Phase 1 clinical trials with our ... Officer, Iain Ross , said that following ...
(Date:8/31/2015)... ... August 31, 2015 , ... Regulatory agencies have ... drug development approval process. Thus, innovator companies must understand what will be needed ... Chicago-based CMO, has been hosting multiple educational panels and seminars for experts to ...
(Date:8/28/2015)... Research and Markets ( http://www.researchandmarkets.com/research/zsgg5n/global_and_usa ) ... USA BioSimilar Market Analysis to 2021" report to ... market will be initiated in September as Sandoz launches ... global market react? Will biosimilars explode into the biologics ... US economy up to $250 billion within the next ...
(Date:8/28/2015)... ... 2015 , ... Riordan-McKenna Institute founders, stem cell ... the use of sterile, dehydrated amniotic tissue AlphaPATCH™ developed by Amniotic Therapies ... knee wound. , The case involved a 78-year-old male, who presented with a ...
Breaking Biology Technology:Novogen Announces The Outcome Of A Comprehensive Science Review 2Novogen Announces The Outcome Of A Comprehensive Science Review 3Novogen Announces The Outcome Of A Comprehensive Science Review 4Novogen Announces The Outcome Of A Comprehensive Science Review 5Novogen Announces The Outcome Of A Comprehensive Science Review 6Regis Shares Expert Advice on Impurities in Drug Development 2Regis Shares Expert Advice on Impurities in Drug Development 3Global & USA BioSimilar Market Analysis Report 2015-2021 2Global & USA BioSimilar Market Analysis Report 2015-2021 3Dallas-Fort Worth Stem Cell Researchers Use Amniotic Tissue To Successfully Treat Non-Healing Surgical Wound 2Dallas-Fort Worth Stem Cell Researchers Use Amniotic Tissue To Successfully Treat Non-Healing Surgical Wound 3Dallas-Fort Worth Stem Cell Researchers Use Amniotic Tissue To Successfully Treat Non-Healing Surgical Wound 4
Cached News: