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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
Acta Veterinaria Scandinavica volume 23, pages 438–445 (1982)
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.
Sammendrag
Testosteron ble målt perifert i plasma hos i alt 258 kyr, fra dag 35 i drektigheten og frem til partus. Resultatene ble sammenstilt for hvert 10-dagers inter vail og verdiene sammenlignet. Ikke på noe tids-punkt ble det påvist signifikante forskjeller mellom kyr med hann-foster og hunnfoster. Den rapporterte høyere abortfrekvens for hann-fostre enn for hunnfostre synes derfor ikke å kunne tilskrives effekten av testosteron secernert fra den føtale testis på mordyrets endokrine balanse.
Til tross for store individuelle variasjoner i testosteronkonsen-trasjonen i plasma på samme tidspunkt i drektigheten, ble det påvist en tydelig økning utover i drektigheten. I perioden 35–80 dager lå nivået på 80–100 pg/ml. Nivået steg så frem til 180. dag hvoretter det stabiliserte seg på ca 200 pg/ml frem til fødselen. Etter f0dselen sank nivået i løpet av første dag og stabiliserte seg på 120 pg/ml.
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Sundby, A., Joakimsen, Ø. Plasma Testosterone in Cows Related to Day of Gestation and Sex of the Foetus, and Plasma Testosterone Levels Around Parturition. Acta Vet Scand 23, 438–445 (1982). https://doi.org/10.1186/BF03546795
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DOI: https://doi.org/10.1186/BF03546795