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The Secretion of Luteinizing Hormone in Ewes of Finnish Landrace During Estrus

LH-sekretionen hos tackor au finsk lantras under brunsten

Abstract

The secretion of luteinizing hormone in ewes of Finnish Landrace during estrus. Acta vet. scand. 1979, 20, 216–223. — Luteinizing hormone immunoreactivity was measured in the venous plasma of four cycling Finnish Landrace sheep during the breeding season in connection with one synchronized estrus and the subsequent one. The ewes were slaughtered after the second estrus to establish the number of ovulations. To determine the LH concentration, a heterologous method of assay was used; this was based on the cross reaction of sheep plasma LH in a human LH radioimmunoassay system.

As a result of the investigation, it was found that the peaks of LH were lower during the time of synchronized estrus and that these peaks occurred earlier than in the subsequent estrus. However, the differences were not statistically significant. On account of the limited material, the effect of the occurrence of the LH peak on the number of ovulations could not be established.

Sammanfattning

Immunoreaktiviteten geniemot LH bestämdes i venöst plasma hos fyra tackor av finsk lantras i samband med cykeln under sexualsäsongen vid en synkroniserad brunst samt den därpåföljande brunsten. Tackorna slaktades efter den andra brunsten för att komma underfund med antalet gula kroppar. En heterologisk assay-metod användes för bestämmandet av LH-koncentrationen ; metoden var baserad på „kors-reaktionen” av plasma LH av får i ett humant LH-radioimmunoassay system.

Undersökningen visade, att LH-topparna var lägre i samband med synkroniserad brunst samt uppstod tidigare än under den följande brunsten. Skillnaderna var emellertid inte statistiskt signifikanta. På grund av det begränsade materialet kunde effekten av tidpunkten för LH-toppen på antalet ovulationer inte med säkerhet bestämmas.

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Pyörälä, E., Lähteenmäki, P., Tühonen, H. et al. The Secretion of Luteinizing Hormone in Ewes of Finnish Landrace During Estrus. Acta Vet Scand 20, 216–223 (1979). https://doi.org/10.1186/BF03546613

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