This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by KRZANOWSKI, M. Search for Related Content PubMed PubMed Citation Articles by KRZANOWSKI, M.

DEPENDENCE OF PRIMARY AND SECONDARY SEX RATIO ON THE RAPIDITY OF SEDIMENTATION OF BULL SEMEN

Summary.: Bull semen was separated by sedimentation in milk, with egg-yolk and powdered milk added. The sex ratio (SR) of the progeny of 2866 cows inseminated with sedimented spermatozoa was compared to that of 2171 cows inseminated with unsedimented semen from the same sires. After insemination with the more rapidly sedimenting spermatozoa, a statistically significant preponderance of females was born compared to the number born after insemination with the remaining fractions of the sedimented semen. The percentage of males born after insemination with the slower sedimenting spermatozoa, however, was not higher than that in the control series. After insemination of sedimented semen, there was an increase in abortion and a deviation of the SR to the disadvantage of the numbers of males born, probably due to a more frequent abortion of male foetuses. The differentiation in the SR of the progeny, depending on the fraction used for insemination, remained, even allowing for correction as to the supposed sex of the aborted foetuses.

It is suggested that the more rapid sedimentation of spermatozoa with an X chromosome was caused by their greater ability to agglomerate.