THE EFFECT OF ASSISTANCE AT CALVING, INJECTIONS OF RECOMBINANT BOVINE SOMATOTROPIN AND JUGULAR CATHETERIZATION ON SERUM CORTISOL AND ITS INFLUENCE ON THE GnRH-INDUCED LH RESPONSE IN POSTPARTUM DAIRY COWS

1 June 1990

journal article
research article
Published by Canadian Science Publishing in Canadian Journal of Animal Science

Vol. 70 (2) , 723-726
https://doi.org/10.4141/cjas90-088

Abstract

Serum cortisol levels were determined in 18 cows administered 25 mg d⁻¹ of recombinant bovine somatotropin or a placebo following jugular vein catheterization on day 14 postpartum. Cows that received assistance at calving had lower (P < 0.01) serum cortisol concentration postpartum. Restraint and catheterization caused an elevation (P < 0.1) of cortisol levels. Treatment with rbST did not effect postpartum cortisol levels. LH response to exogenous GnRH was not affected by the postpartum Cortisol level. Key words: Cortisol, somatotropin, ganadotropin-releasing hormone, luteinizing hormone, dairy cow, stress

Keywords

This publication has 1 reference indexed in Scilit:

Effects of short-term stress, xylazine tranquilization and anesthetization with xylazine plus ketamine on plasma concentrations of cortisol, luteinizing hormone, follicle stimulating hormone and prolactin in ovariectomized pony mares
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