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:5/12/2016)... -- WearablesResearch.com , a brand of Troubadour Research ... the Q1 wave of its quarterly wearables survey. A ... to a program where they would receive discounts for ... "We were surprised to see that so ... , CEO of Troubadour Research, "primarily because there are ...
(Date:5/3/2016)... 2016  Neurotechnology, a provider of high-precision biometric ... Biometric Identification System (ABIS) , a complete system ... ABIS can process multiple complex biometric transactions with ... fingerprint, face or iris biometrics. It leverages the ... MegaMatcher Accelerator , which have been used ...
(Date:4/28/2016)... 2016 First quarter 2016:   ... with the first quarter of 2015 The gross margin ... (loss: 18.8) and the operating margin was 40% (-13) ... Cash flow from operations was SEK 249.9 M (21.2) , ... unchanged, SEK 7,000-8,500 M. The operating margin for 2016 ...
Breaking Biology News(10 mins):
(Date:6/24/2016)... 2016  Regular discussions on a range of subjects including ... two entities said Poloz. Speaking at a lecture ... , he pointed to the country,s inflation target, which is ... "In certain areas there ... common economic goals, why not sit down and address strategy ...
(Date:6/23/2016)... ... June 23, 2016 , ... ... announce the launch of their brand, UP4™ Probiotics, into Target stores nationwide. The ... is proud to add Target to its list of well-respected retailers. This list ...
(Date:6/23/2016)... ... 23, 2016 , ... Charm Sciences, Inc. is pleased to ... AOAC Research Institute approval 061601. , “This is another AOAC-RI approval of the ... Vice President of Regulatory and Industrial Affairs. “The Peel Plate methods perform comparably ...
(Date:6/23/2016)... ... June 23, 2016 , ... STACS DNA Inc., the sample tracking software company, ... Crime Laboratory, has joined STACS DNA as a Field Application Specialist. , “I ... President and COO of STACS DNA. “In further expanding our capacity as a scientific ...
Breaking Biology Technology:
Cached News: