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Plasma Progesterone in Reindeer in Relation to Ovariectomy and Hysterectomy

Plasma progesterone hos reinsdyr ved ovariektomi og hysterektomi.

Acta Veterinaria Scandinavica volume 31, pages 45–51 (1990)Cite this article

Abstract

Four semi-domesticated reindeer were ovariectomized and 3 both ovariectomized and hysterectomized, 30-70 days before expected parturition. Anaesthesia with etorphine/propyonylphenthiazine was followed by an increase in the plasma concentration of progesterone of peripheral blood. The concentration of progesterone returned to pre-anaesthetic values before ovariectomy. Ovariectomy did not result in any substantial change in the plasma progesterone concentration within an observation period of 35–120 min. Hysterectomy was followed by a marked decrease in peripheral plasma progesterone within 60 min. The progesterone concentration in ovarian venous blood was slightly higher than the jugular venous blood in 1 animal and 150 and 400 times higher in the 2 other animals examined. Thus, despite lack of marked changes of progesterone in jugular venous blood upon ovariectomy, it is concluded that the ovaries are a major production site of progesterone in pregnant reindeer.

The progesterone in uterine venous blood was close to that in the jugular vein in 1 animal, and slightly higher in 2 others. This observation, and the maintenance of pregnancy in spite of ovariectomy in 2 out of 4 animals, point to the foeto-placental unit as an additional source of progesterone production.

Sammendrag

Fire tamrein ble ovarieektomert og 3 dyr ble i tillegg deretter hysterektomert 30–70 dager før forventet kalving. Etorphine/propyonylphenthiazineanestesi resulterte i en forbigående økning i progesteronnivået i perifert blod. Før ovarieektomi ble utført hadde progesteronnivået igjen nådd utgangsnivået. Ovarieektomi ga ingen markerte forandringer i plasma progesteronverdiene i obser-vasjonsperioden (35–120 min). Hysterektomi resulterte i et markant fall i progesteronkonsentrasjon i jugularveneblod i løpet av 60 min.

Progesteronkonsentrasjonen i ovarievenen ble hos 1 dyr funnet å være moderat høyere, og hos de 2 andre 150–400 ganger høyere enn i jugularveneblod.

Til tross for manglende effekt av ovarieektomi på plasmaprogesteronnivået, konkluderes det derfor med at ovariene er et hovedproduksjonssted av progesteron hos drektige reinsdyr.

Hos 1 dyr ble progesteronkonsentrasjonen i ute-rusveneblod funnet å være tilnærmet lik konsen-trasjonen i jugularveneblod, mens det hos de 2 andre var litt forhøyet. Denne observasjonen, og det forhold at drektigheten ble opprettholdt etter ovarieektomi hos 2 av 4 dyr tyder på at den føto-placentale enhet bidrar til progesteronproduksjon.

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Authors and Affiliations

  1. Department of Physiology and Nutrition and Department of Obstetrics, Norwegian College of Veterinary Medicine, Oslo, Norway

    Ø. V. Sjaastad, A. K. Blom, R. Austad & E. O. Øen

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  1. Ø. V. Sjaastad
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  2. A. K. Blom
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  3. R. Austad
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  4. E. O. Øen
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Sjaastad, Ø.V., Blom, A.K., Austad, R. et al. Plasma Progesterone in Reindeer in Relation to Ovariectomy and Hysterectomy. Acta Vet Scand 31, 45–51 (1990). https://doi.org/10.1186/BF03547576

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Acta Veterinaria Scandinavica

ISSN: 1751-0147