A review of published reports showed that the sex ratio (proportion of boys) was low among infants conceived after ovulation had been induced. The difference between the observed sex ratio and an expected one of 0 . 514 was highly significant. These findings suggest that maternal gonadotrophin concentrations at the time of conception directly affect the sex of the zygote.

introduction secondary sex ratio (ssr) is the proportion of males to females at birth. it has been shown in many different mammalian species, many factors are associated with ssr. changes in secondary sex ratio in dairy cows is considered economically important and the ability to change it could affect the revenues and profitability of a dairy farm. thus, sperm or embryo sexing techniques in re...

the follicle arrangement and secondary to primary follicle ratio (s/p) were studied in the ‎skin of nine male and nine female markhoz goats breed from one week to 16 weeks of age. the ‎skin samples were taken from mid-side area of each animal in nine stages every other week. the ‎follicles were arranged in groups, predominantly including three primary and several ‎secondary follicles. each prim...