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Plasma Prolactin in the Sow with Emphasis on Variation in Resumption of Ovarian Activity after Weaning

Plasma prolaktin hos purke spesielt i relasjon til ovarialaktiviteten etter avvenning

Abstract

Plasma prolactin in the sow was studied during pregnancy, lactation and during the post weaning period. The ovarian activity was monitored hy progesterone determinations. In the pregnant sows (2 sows) there was a distinct increase in prolactin values ahout a week before parturition, amounting to maximum levels around parturition. A moderate decrease in prolactin values during the lactation period (3 sows) was observed. After weaning the prolactin values dropped immediately to basal levels. Of the 91 sows studied in the post weaning period 72 sows resumed cyclic ovarian function within normal time (10 days) after weaning while 19 sows had delayed resumption of ovarian activity. The prolactin patterns in sows with prolonged periods of ovarian inactivity were similar to those seen in normal sows. None of our results indicate that post weaning anoestrus is caused by prolonged hyperprolactinaemia after weaning.

Sammendrag

Plasma prolaktin hos purke ble undersøkt under drektighet, laktasjon og i perioden etter avvenning. Purkenes ovarialaktivitet ble undersøkt ved hjelp av progesteronmålinger. Hos de drektige purkene (2 purker) var det en klar stigning i prolaktinnivåene cirka en uke før grising og de høyeste verdiene ble funnet i tiden like rundt partus. I løpet av laktasjonen (3 purker) ble det registrert et moderat fall i prolaktin verdiene. Etter avvenning gikk konsentrasjonene av prolaktin i plasma raskt ned til basalnivået. Av de 91 purkene som ble undersøkt i perioden etter avvenning, ovulerte 72 purker innen 10 dager etter avvenning, mens 19 purker hadde forsinket igangsetting av ovarialfunksjonen. Purkene med forsinket igangsetting av syklisk ovarialfunksjon etter avvenning hadde samme prolaktinmønster som purker som gjenopptok ovarialfunksjonen etter normal tid. Resultatene tyder ikke på at anøstrus hos purke etter avvenning skyldes hyperprolaktinemi.

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Financial support was given by the Norwegian Agricultural Research Council.

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Benjaminsen, E. Plasma Prolactin in the Sow with Emphasis on Variation in Resumption of Ovarian Activity after Weaning. Acta Vet Scand 22, 67–77 (1981). https://0-doi-org.brum.beds.ac.uk/10.1186/BF03547208

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