Coital rate, cycle day of insemination and sex ratio
James, W.H.
Journal of Biosocial Science 9(2): 183-189
1977
ISSN/ISBN: 0021-9320 PMID: 558191 DOI: 10.1017/s002193200001097xDocument Number: 303205
Guerrero (1975) has cited a wealth of direct data supporting the hypothesis that timing of insemination is related to the sex of the resulting zygote. It is argued that if this hypothesis were correct, then parental coital rate would be associated with the sex of the resulting children. It is suggested that empirical data support this inference and support the hypothesis. It is estimated that if Pmale (the probability that a zygote will be male) declines linearly across the fertile period, that decline is from about 0.57 to 0.45.