Single Embryo Blastocyst Transfer May Lead to An Altered Sex Ratio Imbalance

2005 ◽  
Vol 84 ◽  
pp. S89 ◽  
Author(s):  
J. Barritt ◽  
M. Duke ◽  
J. Klein ◽  
A. Devenuta ◽  
B. Sandler ◽  
...  
Keyword(s):  
Sex Ratio ◽  
Blastocyst Transfer ◽  
Sex Ratio Imbalance

Blastocyst transfer does not cause a sex-ratio imbalance

2008 ◽  
Vol 90 ◽  
pp. S348 ◽  
Author(s):  
G.C. Weston ◽  
T. Osianlis ◽  
J. Catt ◽  
B.J. Vollenhoven
Keyword(s):  
Sex Ratio ◽  
Blastocyst Transfer ◽  
Sex Ratio Imbalance

Blastocyst transfer does not cause a sex-ratio imbalance

2009 ◽  
Vol 92 (4) ◽  
pp. 1302-1305 ◽  
Author(s):  
Gareth Weston ◽  
Tiki Osianlis ◽  
James Catt ◽  
Beverley Vollenhoven
Keyword(s):  
Sex Ratio ◽  
Blastocyst Transfer ◽  
Sex Ratio Imbalance

Sex ratio imbalance and birth weight in newborns with isolated hypertrophic pyloric stenosis

2003 ◽  
Vol 23 (1) ◽  
pp. 43-43 ◽  
Author(s):  
S. Bianca ◽  
C. Ingegnosi ◽  
M. A. Barbagallo ◽  
G. Ettore
Keyword(s):  
Birth Weight ◽  
Sex Ratio ◽  
Pyloric Stenosis ◽  
Hypertrophic Pyloric Stenosis ◽  
Sex Ratio Imbalance

scholarly journals Causes and consequences of adult sex ratio imbalance in a historical U.S. population

2017 ◽  
Vol 372 (1729) ◽  
pp. 20160314 ◽  
Author(s):  
Ryan Schacht ◽  
Ken R. Smith
Keyword(s):  
Biological Sciences ◽  
Sex Ratio ◽  
Life History Traits ◽  
Male Mating ◽  
Age At First Birth ◽  
The Social ◽  
Adult Sex Ratio ◽  
Sex Ratio Imbalance ◽  
Animal Societies

The responsiveness of individuals to partner availability has been well-documented across the literature. However, there is disagreement regarding the direction of the consequences of sex ratio imbalance. Specifically, does an excess of males or females promote male–male mating competition? In an attempt to clarify the role of the adult sex ratio (ASR) on behaviour, here we evaluate both competing and complimentary expectations derived from theory across the social and biological sciences. We use data drawn from a historical, nineteenth century population in North America and target several life-history traits thought to be affected by partner availability: age at first birth, relationship status, completed fertility and longevity. Furthermore, we assess the role of various contributors to a population's ASR. We find that both the contributors to and consequences of sex ratio imbalance vary over time. Our results largely support predictions of greater male pairbond commitment and lesser male mating effort, as well as elevated bargaining power of women in response to female scarcity. After reviewing our findings, and others from across the literature, we highlight the need to adjust predictions in response to ASR imbalance by the: (i) culturally mediated mating arena, (ii) variable role of demographic inputs across time and place, (iii) constraints to behavioural outcomes across populations, and (iv) ability and accuracy of individuals to assess partner availability. This article is part of the themed issue ‘Adult sex ratios and reproductive strategies: a critical re-examination of sex differences in human and animal societies’.

Impact of blastocyst transfer on offspring sex ratio and the monozygotic twinning rate: a systematic review and meta-analysis

2009 ◽  
Vol 91 (6) ◽  
pp. 2381-2390 ◽  
Author(s):  
Hye Jin Chang ◽  
Jung Ryeol Lee ◽  
Byung Chul Jee ◽  
Chang Suk Suh ◽  
Seok Hyun Kim
Keyword(s):  
Systematic Review ◽  
Sex Ratio ◽  
Meta Analysis ◽  
Blastocyst Transfer ◽  
Offspring Sex Ratio ◽  
Monozygotic Twinning ◽  
Offspring Sex

Sex ratio of offspring as a result of blastocyst transfer compared with early cleavage stage transfer

2008 ◽  
Vol 90 ◽  
pp. S370
Author(s):  
M. Dangcil ◽  
P. Barton ◽  
D. Swihart ◽  
D. Erickson ◽  
J.A. Proctor ◽  
...  
Keyword(s):  
Sex Ratio ◽  
Blastocyst Transfer ◽  
Cleavage Stage ◽  
Early Cleavage

Trophectoderm grade significantly affects the sex-ratio imbalance in favor of male offspring

2013 ◽  
Vol 100 (3) ◽  
pp. S463
Author(s):  
T. Habara ◽  
S. Terada ◽  
N. Yoshioka ◽  
N. Hayashi
Keyword(s):  
Sex Ratio ◽  
Male Offspring ◽  
Sex Ratio Imbalance
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