Please note,these are only studies that support swaying. There are studies that do not support it but they are not listed here. Also note that the studies supporting EGS are in the Swaying gold forum. Please remember.....
SWAYING IS NOT 100% ONLY PGD IS!!!
Diet Studies:
Link to 1940 study:
http://www.in-gender.com/cs/forums/thread/16415.aspx
1971: http://www.biolreprod.org/cgi/content/abstract/71/4/1063
1983: Animal studies: Study says that high potassium diets raise the pH. http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=393590
1992: http://findarticles.com/p/articles/mi_m0841/is_n3_v27/ai_12448854/pg_2
2001: This study goes into the impact potassium has on cm and how potassium can actually be found in the cm on a molecular level helping selected sperm with migration
http://molehr.oxfordjournals.org/cgi/content/full/7/9/819
2003: http://www.pnas.org/cgi/content/abstract/100/8/4628
2003: http://www.pjbs.org/pjnonline/fin128.pdf
2004: This one is similar to 1971 one but it used more animal studies. http://www.biolreprod.org/cgi/reprint/71/4/1063
2004: http://humrep.oxfordjournals.org/cgi/content/extract/18/5/1133-a
2005: This study shows that for rats, diets high in Calcium and Magnesium and low in Potassium and salt favors girls
http://www3.interscience.wiley.com/cgi-bin/abstract/109927307/ABSTRACT
2006: This study says that the reason high tech can't be 100% is because of the maternal influences. Suggesting that diet and supplements might have an affect on gender out come.
http://www.biolreprod.org/cgi/content/abstract/biolreprod.106.056259v1
2007: This study shows that the gender diet can favor males/females in rats
http://www.pjbs.org/pjnonline/fin554.pdf
2008: diet does effect gender
http://rspb.royalsocietypublishing.org/content/275/1643/1661.full.pdf+html
2009- This study shows how diet can effect sex ratio:
http://www.obgynsurvey.com/pt/re/obgynsurv/abstract.00006254-200901000-00006.htm;jsessionid=JqXWShJ7rdWqMvM8wCtqxyCNxrn5tlCyQ3nNvqKLjC6DXgYGcLKp!-1529289070!181195628!8091!-1
2009- In fish this study shows that potassium and calcium make sperm behave in different ways
http://www.ncbi.nlm.nih.gov/pubmed/19280359
2010- calcium and magisum sway girl, potasium and sodium boy http://www.news.com.au/breaking-news/stick-to-beans-and-hard-cheese-if-you-want-a-baby-girl-say-scientists/story-e6frfku0-1225914498540#ixzz0yfn48b8q
Caffiene:
1983- Caffeine gives sperm huge boost in speed:
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=393590
1984 -Caffeine gets into semen in about an hour.
http://jcp.sagepub.com/cgi/content/abstract/24/2/120
2003: Coffee makes sperm go faster
http://www.newscientist.com/article.ns?id=dn4267
2006 caffeine takes one hour to get into all parts of the body:
http://www.abc.net.au/health/library/caffeine_ff.htm
"distribution of caffeine into semen rapidly equilibrates with that in the blood.. and drinking four cups or more of coffee per day.. decreases sperm motility" So caffeine gets into semen in under and hour but don't allow dh more than one cup of caffeine a day!:
http://72.14.209.104/search?q=cache:WGUXMKpnYDkJ:www.pr.mq.edu.au/macnews/showitem.asp%3FItemID%3D318+semen,+caffeine&hl=en&gl=us&ct=clnk&cd=2
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pH Studies:
"CM pH from 9-9.9 favors boys"
Y sperm thrive in a high cm pH, however you don't want it to be any higher than 9.9 for cm and ew (dh can be higher). You can change cm pH threw diet, supplements, baking soda douche) or with lubricant (pre-seed. but it isnt' high enough for a great sway)
1975: http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&list_uids=1065697&dopt=Citation
1981: This study shows that pH can change the ion composition of the sperm- high pH favoring boy sperm, low pH favoring girl sperm. It also goes into a theory about egg polarity.
http://www.freepatentsonline.com/4276139.html
1983: This study shows that a high pH not only favors boys but it causes sperm to swim faster. This studies has a bunch of fun graphs and charts to:
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=393590
1987 http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=3675523&dopt=Citation
1988: Chemical balance of the female genital tract have an effect on sex ratio at conception
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=3071849&dopt=Citation
2004: pH has a impact in sex selection along with several other theories. He goes on to say that in most humans pH is Highest at time of O:
http://humrep.oxfordjournals.org/cgi/content/full/19/6/1250
2005: Claims that it proves that high pH favors boys. It also goes on to say that moon can have a effect on cm pH.
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=16295726&dopt=Citation
2006: This study shows that different types of CM can select different types of sperm:
http://taylorandfrancis.metapress.com/(wttelrfhrigetqfq0sj5hc45)/app/home/contribution.asp?referrer=parent&backto=issue,8,12;journal,6,48;linkingpublicationresults,1:102430,1
2008: The female reproductive track directly effect gender outcome
http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=1384548
2010: pH effects sperm when they enter the cm in the female track
http://www.ivf.net/ivf/discovered_the_starting_pistil_for_sperm-o4811.html
Link to Lubricant pH: http://www.ingfertility.com/damage.html
Low pH favors girls. Douche help to lower pH. Douches from the very best to the least best are:
-Vinegar 7% with calcium should be a pH of 4:
http://www.in-gender.com/CS/forums/p/16792/145928.aspx#145928
1997-Why calcium is important in it: http://www.springerlink.com/content/3r7uxmkyxt18rcax/ -Lime douche (lime and water) should be a pH of 2. This is low because lime pH tends to climb.-Store bought douche works the least but is the easiest.*Instead of douche you can use rephresh or replens: http://www.in-gender.com/cs/forums/t/46148.aspx
2006- Lowering men's pH of semen. Men who take Cranberry pills can lower their Ph.
http://ezinearticles.com/?Your-Semen---A--Diet--For-Better-Sperm-Taste&id=138648
DH’s pH does matter! But his pH when coming out of the body should not drop below a 7 (below a 7 and he will be shotting dead sperm). So you want his to be 7-7.5. Once semen is out of the body it can be lowered to a pH of 4-4.5.
Several animal studies from 1950s confirm that male pH actually matters a lot! “Weir began in 1953 a new series of experiments in which he developed two strains of mice, one with an average blood pH of 7.42 and the other with an average blood pH of 7.46. He found that the interbreeding of those mice with the blood pH of 7.42 altered the female/male sex ratio from 50:50 to 60:40 and the interbreeding of the mice with the blood pH of 7.46 altered the ratio to about 40:60. By cross breeding or reciprocal mating of different sexes of the two strains, he demonstrated that it was the blood pH of the male and not the female which determined the sex ratio of the young.” WEIR, J. A. 1953. Association of blood pH with sex ratio in mice. J. of Heredity 44:133-138. WEIR, J. A. 1955. Male influence on the sex ratio of offspring in high and low blood pH. J. of Heredity 46:277-283. I found this at: http://www.freepatentsonline.com/4225405.html. (This link contains references to several other interesting studies, which might be worth looking into.)
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Sperm Studies:
Y sperm and X sperm swim the same speed. However they swim differently. x sperm swim at zig zags in a flow while y sperm are strait swimmers. These studies support that
1984: http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=6541168&dopt=Citation
2004: http://molehr.oxfordjournals.org/cgi/reprint/3/1/61
2004:
http://taylorandfrancis.metapress.com/(rjz2hgqk4zhlz52kg2wzj245)/app/home/contribution.asp?referrer=parent&backto=issue,9,10;journal,18,48;linkingpublicationresults,1:102430,1
2007:
http://resources.metapress.com/pdf-preview.axd?code=k60gw7j1tw382162&size=largest
"High sperm count favors boys" "Low sperm count favors girls"
After much research I have found studies that say high testosterone favors high sperm count, and high testosterone favors male offspring, therefore high sperm count favors male offspring.
1998: This studies shows that low sperm count (or damaged sperm count) favors girls
http://www.andrologyjournal.org/cgi/reprint/19/1/5
2003: This study shows that high testosterone favors boys
http://humrep.oxfordjournals.org/cgi/content/extract/18/5/1133-a
2004: This study show that both testosterone for the male favors boys and it also shows that hormones in the female can also play a role
http://humrep.oxfordjournals.org/cgi/content/full/19/6/1250
Theory: High sperm count favors boys and low sperm count favors girls. For dh under 48 hours of abstance or over 7 days is low sperm count and over 48 hour to 6 days (with day 4 being the highest) is high sperm count
1979- http://www.reproduction-online.org/cgi/content/abstract/57/2/391
1994- http://www.ncbi.nlm.nih.gov/sites/entrez?cmd=Retrieve&db=PubMed&list_uids=7820161&dopt=Citation
2004- http://www.fertstert.org/article/PIIS0015028204006053/abstract
2004- http://patient-research.elsevier.com/patientresearch/displayAbs?key=S0015028204006053&referrer=scholar.google.com%252Fscholar%253Fhl%253Den%2526lr%253D%2526safe%253Dactive%2526q%253D%252522sperm%252Bcount%252522%25252C%252B%252522abstinence%252522%252B7%252Bdays
2004- http://www.fertstert.org/article/PIIS0015028204008775/abstract
2005- http://www.urotoday.com/44/browse_categories/male_infertility/extended_abstinence_reduces_sperm_viability_in_infertile_men.html
2005- http://www.in-gender.com/CS/forums/p/6605/49085.aspx#49085
2009- http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B8JJ6-4TYXMC3-2&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=4d2c195e601b32a9ed4767487f9bca45
Over 5+ days before O and O day sways boy.
1996- http://humrep.oxfordjournals.org/cgi/reprint/11/1/2
2004- http://humrep.oxfordjournals.org/cgi/content/full/19/6/1250
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Cervical Mucus Studies: "Egg White Cervical Mucus favors boys"
The most fertile cervical mucus favors boys because: 1. Y sperm swim fastest in it than x sperm 2. They live longer in ewcm 3. Usually the pH of ewcm is right for y sperm
2003: This is a great study that shows how the 4 different stages of cm affect different sperm migration
http://humrep.oxfordjournals.org/cgi/content/full/18/9/1782
2004: This study shows when Y sperm are in ewcm that they swim faster and thrive in the environment. It goes on to say that y sperm in ewcm have a "68% of the male offspring births"
http://taylorandfrancis.metapress.com/(gcyywe55nhme1p55zc0nrl45)/app/home/contribution.asp?referrer=parent&backto=issue,9,10;journal,18,48;linkingpublicationresults,1:102430,1
2004: This study shows that cm has a filter affect and can 'chose' sperm.
http://molehr.oxfordjournals.org/cgi/content/full/10/2/137
"CM pH from 4-4.5 favors girls"
Y sperm hate low pH. X sperm can handle low pH with no problems. You can change cm pH threw diet, supplements, douche (lime) or with lubricant (refresh)
1975:
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&list_uids=1065697&dopt=Citation
1981: This study shows that pH can change the ion composition of the sperm- high pH favoring boy sperm, low pH favoring girl sperm. It also goes into a theory about egg polarity.
http://www.freepatentsonline.com/4276139.html
1983: This study shows that a low pH not only favors girls but it causes sperm to swim slower. This studies has a bunch of fun graphs and charts to:
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=393590
1988: Chemical balance of the female genital tract have an effect on sex ratio at conception
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=3071849&dopt=Citation
2004: This study says that pH has a impact in sex selection along with several other theories. He goes on to say that in most humans pH is Highest at time of O:
http://humrep.oxfordjournals.org/cgi/content/full/19/6/1250
2005: This study claims that it proves that high pH favors boys. It also goes on to say that moon can have a effect on cm pH.
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=16295726&dopt=Citation
2006: This study shows that different types of Cervical mucus can select different types of sperm:
http://taylorandfrancis.metapress.com/(wttelrfhrigetqfq0sj5hc45)/app/home/contribution.asp?referrer=parent&backto=issue,8,12;journal,6,48;linkingpublicationresults,1:102430,1
Animal studies:
1987 Sept. http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=3675523&dopt=Citation
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Hormone Studies:
Theory: High levels of female testosterone or estrogen favor boy conceptions:
1996: http://humrep.oxfordjournals.org/cgi/content/abstract/11/11/2371
2001: http://humrep.oxfordjournals.org/cgi/content/full/16/1/198?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=sex%252Bratio&searchid=1103414121688_2119&stored_search=&FIRSTINDEX=0&volume=16&issue=1&journalcode=humrep
2003: http://human-nature.com/ep/articles/ep0196107.html
2003: http://humrep.oxfordjournals.org/cgi/content/extract/18/5/1133-a
2004: http://humrep.oxfordjournals.org/cgi/content/full/19/6/1250
2006: http://jds.fass.org/cgi/content/abstract/89/6/2119
2006: http://www.biolreprod.org/cgi/content/abstract/biolreprod.106.056259v1
2007: high female testosterone favors boy conceptions:
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WMD-4N3P0CS-1&_user=10&_coverDate=06%2F21%2F2007&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=d02d1766e39248a07148a47ca4085cd3
2008: http://www.biolreprod.org/cgi/content/abstract/biolreprod.107.066050v1
2008: http://www.health.auckland.ac.nz/psychmed/staff/vals%20papers/2008%20sex%20offspring.pdf
2008: http://www.timesonline.co.uk/tol/life_and_style/health/features/article3598093.ece
2009: http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WMD-4VDY876-2&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=3b0694ad32af8d15127e36025f705797
2010: http://jech.bmj.com/content/64/01/96.1.extract
2010: http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=7853996
2011- Progesterone has a direct link to calcium channeling http://www.nature.com/nature/journal/v471/n7338/abs/nature09767.html
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Ion Studies:
"Postive ions favor boy conceptions"
http://www.in-gender.com/CS/forums/p/12162/101012.aspx#101012
http://www.in-gender.com/CS/forums/p/12453/112208.aspx#112208
http://www.kiflow.com/info/ions.html
"Negative ions favor girl conceptions"
http://www.in-gender.com/CS/forums/p/12162/101012.aspx#101012
http://www.in-gender.com/CS/forums/p/12453/112208.aspx#112208
http://www.kiflow.com/info/ions.html
more ion studies for both ttc boys and girls-
1999- Egg chooses sperm- http://74.125.95.132/search?q=cache:zbYZAaAjSfwJ:www.weizmann.ac.il/Biological_Chemistry/scientist/Eisenbach/pdf/P83.pdf+80+percent+of+human+eggs+are+bad&hl=en&ct=clnk&cd=9&gl=us
2004- Discussion of egg polarity http://discovermagazine.com/2004/may/cover/?searchterm=embryo%20viability
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Conception Month Studies:
1999- This study claims that mothers born in Feb - April are more likely to have a girl. http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=pubmed&cmd=Retrieve&dopt=AbstractPlus&list_uids=10510576&query_hl=46&itool=pubmed_docsum
1999- http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=pubmed&cmd=Retrieve&dopt=AbstractPlus&list_uids=10510576&query_hl=46&itool=pubmed
2003- This study says there is a correlation between boy births and fall conception - with october being the peak month. Spring slightly favors girls, summer favors girls, fall slightly favors boys winter favors boys http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=pubmed&cmd=Retrieve&dopt=AbstractPlus&list_uids=12660290&query_hl=35&itool=pubmed_DocSum
2003- Here's a better-written article about the increased number of boys conceived during the months of october - november (for the northern hemisphere). This trend is shifted by 6 months for the southern hemisphere.
http://www.eurekalert.org/pub_releases/2003-03/esfh-irr032403.php
2003- http://www.eurekalert.org/pub_releases/2003-03/esfh-irr032403.php
2005- October is a boy-heavy month. http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?itool=abstractplus&db=
According to this, women who smoke heavily (at least a pack a day) are 1/3 less likely to have a boy. And if dad smokes too, then your chances to have a boy are cut in 1/2. So give up smoking if you want a boy! pubmed&cmd=Retrieve&dopt=abstractplus&list_uids=16009195
2005- Posted studies for TTC girl:
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?itool=abstractplus&db=pubmed&cmd=Retrieve&dopt=abstractplus&list_uids=16009195
2008 http://journals.royalsociety.org/content/h532x5114713644t/
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Trivers Willard Hypothesis:
This is taken from Kris blog: it states that for mothers who are in better physical condition to have more boys, while mothers in poorer physical condition, would tend to have girls.
1996- http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WJS-45MGY3V-T&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=dcacef09fefe861b52e925e38054c852
1998- http://www.springerlink.com/content/77pd5lq82xuh26y8/
1999- http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6T6H-3VW83M2-8&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=0a49fb5f453eefca5de5c496d3b8c1eb
1999- http://www.pnas.org/content/96/2/570.abstract
2000- http://www.springerlink.com/content/73qq547r3425r981/
2004- http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1691865
2004- http://www.journals.uchicago.edu/doi/abs/10.1086/381003
2005- http://scholar.google.com/scholar?hl=en&lr=&q=info:4xvLdLtDx7cJ:scholar.google.com/&output=viewport&pg=1
2005- http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WMD-4FV366C-5&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=ed01bb939d9769643d96b6fde480b992
2005- http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WMD-4F3FSD9-1&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=0602aadf6fd7bb0d6337dfd6db420769
2005- http://www.journals.uchicago.edu/doi/abs/10.1086/497440
2005- http://humrep.oxfordjournals.org/cgi/reprint/21/10/2486
2006- http://rspb.royalsocietypublishing.org/content/273/1584/293.abstract
2007- http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WMD-4KGHWX3-2&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=f9c04b062ca4448b7f1613bd8ba87ac8
2007- http://www.atypon-link.com/AEAP/doi/abs/10.1257/jep.21.2.91
2008- http://rspb.royalsocietypublishing.org/content/275/1643/1661.abstract
2008- http://rspb.royalsocietypublishing.org/content/275/1632/323.abstract
2008- http://www.akademiai.com/content/h903878950627777/
2008- http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6W9W-4R2GX4G-4&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=2e9912c9bd2382e75533d359f5c6e475
2009- http://www.ncbi.nlm.nih.gov/pubmed/19306221
2009- http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=2614476
2009- http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=2663335
2010- http://www.biomedcentral.com/content/pdf/1471-2458-10-269.pdf
2010: http://www.reproduction-online.org/cgi/content/abstract/140/3/425
2010: http://www.springerlink.com/content/bng4m438852pl744/
2010: http://molehr.oxfordjournals.org/content/16/8/539.abstract
2011: http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0016296
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Miscellaneous Studies:
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2007- Pre-O temps that are higher than normal favor girls and lower than normal boys.
http://www.obgyn.net/fetal-monitoring/fetal-monitoring.asp?page=/fm/articles/fetal_gender_placental_location_pg4
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"Chasing the gender dream"- J. Merril Thompson , Page 21 (Parental age and gender)
http://www.in-gender.com/survey/Results_Misc.aspx
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Vitex increases LP length and progesterone levels. The first is important for preventing miscarriage and the second is proposed (on this site) to increase the chance for a girl.
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=pubmed&cmd=Retrieve&dopt=AbstractPlus&list_uids=15134155&query_hl=1&itool=pubmed_DocSum
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Timing:
There are two timing methods to choose from for ttc a girl: cut off or o+12. O+12 has better success rates.
1980 (englund): O+12 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1713947/?page=1
1985: (New Zealand) O+12 http://www.naturcomp.sk/stazeni/studie/NC_study_New_Zeeland_84.pdf
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2006- Want a girl? Then go on a diet and lose some weight.
[ 23 Jun, 2006 1331hrs IST IANS ]
WELLINGTON: Want to have a baby boy? Tuck into the burgers, fries and ice cream. Want a girl? Then go on a diet and lose some weight. It works for cows, according to John Roche, a scientist at New Zealand's dairy research organisation Dexcel. "And we would expect what holds true for one mammal will hold true across the board," he said. Dexcel and Ireland's Teagasc agricultural organisation studied 1,200 cows in an 18-year research project from 1986 to 2004. They found that cows that gained weight before conceiving were more likely to give birth to bull calves. Those shedding kilos before conception had a better chance of producing heifers (females).
Roche told the Waikato Times , published in Hamilton at the heart of New Zealand dairying country, the research underlined the theory that humans had some control over the sex of their children. "Many theories have been put forward," he said, citing weather patterns, phases of the moon, bathing rituals and the timing of intercourse. "However, there has been little consistent scientific evidence till now."
Roche said it was not clear exactly why weight affected the sex of a cow's offspring. Although the male determined the sex of the embryo at conception, the female had some control over whether to keep a male or a female one. "It's an evolutionary adaptation," he said. "In the wild, males compete with each other for a partner and the bigger male has a distinct advantage. "Female size is not as crucial. Therefore, any particular maternal characteristic that results in a larger offspring is likely to produce more males. "If anything reduces the size of the offspring at birth, it is a disadvantage to the individual to be born male - therefore, there is a greater probability of it being female." Roche said a cow losing weight before conception may have some mechanism that prompted it to reject a male embryo because it was not up to supporting the development of a bull calf.
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2007- “Smoking and Conception” According to this, women who smoke heavily (at least a pack a day) are 1/3 less likely to have a boy. And if dad smokes too, then your chances to have a boy are cut in 1/2. http://www.smh.com.au/news/National/Smokers-more-likely-to-have-girls-study/2007/04/11/1175971135421.html
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1999- weather can effect gender: http://articles.latimes.com/1999/aug/02/health/he-61988
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2006 Toxoplasma sways for boys: http://www.springerlink.com/content/t8l7j323rp17l5t1/2008 Environmental Chemicals sways for girl: http://www.ehponline.org/members/1999/107p813-815vartiainen/vartiainen-full.html
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heat sways girls
2008- http://rsbl.royalsocietypublishing.org/content/4/1/60.abstract
2009- http://rsbl.royalsocietypublishing.org/content/early/2009/03/31/rsbl.2009.0069.abstract
2009 http://www.newscientist.com/article/dn16879-first-link-found-between-latitude-and-sex-of-babies.html
2009 http://www.nytimes.com/2009/04/21/health/21sex.html?_r=1
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2009- being old sways girls http://www3.interscience.wiley.com/journal/121476907/abstract
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2011- The age you got af may determine if you are a mom of a certain gender http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0016296
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2004- this study supports the idea of 7 sway factors http://humrep.oxfordjournals.org/cgi/reprint/19/6/1250
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2005- living with a male partner (dh) produces more boys http://www.npr.org/templates/story/story.php?storyId=4758495
