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Oophorectomy During Different Stages of Pregnancy in the Cow

Oophorektomi av kor under olika stadier av dräktigheten

Acta Veterinaria Scandinavica volume 22, pages 553–565 (1981)Cite this article

Abstract

Thirteen cows of the Swedish Red and White Breed (SRB) were subjected to bilateral oophorectomy in the period 105–251 days of pregnancy. Eleven of the animals delivered their fetuses before the expected day of parturition, while 2 which were oophorectomized on days 205 and 212 calved at the expected time. Eleven of the cows had retained fetal membranes following abortion/ parturition. Following surgery the peripheral plasma levels of progesterone dropped to levels about 10 % of the pretreatment levels. Animals oophorectomized between days 105 and 157 of pregnancy had a lower postsurgical progesterone concentration than cows operated on at days 205–251 of pregnancy. No increase of the peripheral plasma levels of estrone in connection with abortion was seen in cows operated on in early stages of pregnancy (< 200 days) while those operated on in later stages and maintaining the pregnancy for at least 17 days post oophorectomy showed an increase of estrone before parturition. The 2 cows that calved at the expected time had an increase of prepartum estrone similar to that seen at spontaneous calving.

Sammanfattning

I försöket ingår 13 kor på vilka äggstockarna bortopererats vid dräktighetsstadier varierande från 105 till 251 dagar. Två kor vilka opererats å respektive dag 205 och 212 bar sina foster dräktighetstiden ut medan de övriga kalvade tidigare än beräknat. Hos två av de 13 djuren avgick efterbörden spontant inom 24 timmar efter aborten/ förlossningen. Efter operationen sjönk progesteronvärdena till låga nivåer.

De kor vilka opererats under tidiga dräktighetsstadier (105–157 dagar) hade påtagligt lägre progesteronvärden efter operationen jämfört med de kor vilka opererats senare under dräktigheten (> 200 dagar). Detta kan sannolikt förklaras med en progesteronsekretion från de nuaterna binjurarna under den sista tredjedelen av dräktigheten.

Efter oophorektomi vid tidiga dräktighetstider förändrades den materna blodöstronkoncentrationen ej påtagligt. Hos djur som opererats under sena dräktighedsstadier och som vidmakthöll dräktigheten i minst 17 dagar efter operation var östronnivån påtagligt förhöjd i samband med förlossningen. De två djur som opererades under sent dräktighetsstadium och som kalvade vid beräknad tidpunkt hade en prepartal östronökning som var snarlik den som ses före normalförlossning.

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Authors and Affiliations

  1. Department of Obstetrics and Gynaecology and the Department of Clinical Chemistry, College of Veterinary Medicine, Swedish University of Agricultural Sciences, S-750 07, Uppsala, Sweden

    J.-O. Lindell, L.-E. Edqvist & B. Gustafsson

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  1. J.-O. Lindell
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  2. L.-E. Edqvist
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  3. B. Gustafsson
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This work was supported by grants from the Swedish Council for Forestry and Agricultural Sciences.

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Lindell, JO., Edqvist, LE. & Gustafsson, B. Oophorectomy During Different Stages of Pregnancy in the Cow. Acta Vet Scand 22, 553–565 (1981). https://doi.org/10.1186/BF03548679

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Acta Veterinaria Scandinavica

ISSN: 1751-0147