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. 1982 Sep 1;23(3):438–445. doi: 10.1186/BF03546795

Plasma Testosterone in Cows Related to Day of Gestation and Sex of the Foetus, and Plasma Testosterone Levels Around Parturition

Plasma testosteron i kyr i relasjon til drektighetsdag og kjønn av fosteret og plasma testosteron rundt fødsel

A Sundby 1,✉, Ø Joakimsen 1
PMCID: PMC8295826  PMID: 7180787

Abstract

No significant differences in plasma testosterone level were observed between cows carrying a male foetus and cows carrying a female foetus at any ten-day interval from day 35 of gestation until parturition. Reported higher abortion rates for male than for female foetuses would thus appear not to be due to effects of foetal testosterone on the maternal endocrine balance. In spite of a great individual variation in plasma testosterone values at similar stages of gestation, certain trends are evident. From the 35th to the 80th day of gestation the average concentration was 90–100 pg/ml. Later it rose and reached 200 pg/ml on the 180th day, remaining at this level until after partus. During the first day after parturition plasma testosterone fell significantly and stabilized around 120 pg/ml.

Keywords: Cow, gestation, parturition, plasma testosterone, foetal sex

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