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:


(Date:4/13/2017)... April 13, 2017 UBM,s Advanced Design and ... will feature emerging and evolving technology through its 3D ... will run alongside the expo portion of the event ... and demonstrations focused on trending topics within 3D printing ... and manufacturing event will take place June 13-15, 2017 at ...
(Date:4/11/2017)... -- NXT-ID, Inc. (NASDAQ:   NXTD ) ("NXT-ID" ... of independent Directors Mr. Robin D. Richards and ... furthering the company,s corporate governance and expertise. ... Gino Pereira , Chief Executive Officer ... guidance and benefiting from their considerable expertise as we move ...
(Date:4/4/2017)... , April 4, 2017   EyeLock LLC ... announced that the United States Patent and Trademark Office ... broadly covers the linking of an iris image with ... transaction) and represents the company,s 45 th issued ... patent is very timely given the multi-modal biometric capabilities ...
Breaking Biology News(10 mins):
(Date:4/21/2017)... ... April 21, 2017 , ... The ... the focus of researchers, engineers, product developers, and industry suppliers gathered last week ... by SPIE, the international society for optics and photonics , the event ...
(Date:4/20/2017)... , ... April 20, 2017 , ... ... , this new webinar will explore challenging patient cases when screening for direct ... hospital, there may be a need for bridging parental anticoagulation especially for those ...
(Date:4/20/2017)... ... April 20, 2017 , ... Husson ... clinical research community’s growing body of knowledge during its Eighth Annual Research ... and the adjacent Darling Atrium. During the event, undergraduates, graduate students, and faculty ...
(Date:4/20/2017)... ... April 20, 2017 , ... Parallel6™ , the leader ... announced today that they were named one of the 2017 Top 10 eClinical ... developments in the pharmaceutical industry. , “We take pride in honoring Parallel6 as one ...
Breaking Biology Technology:
Cached News: