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Effect of Blood Sampling and Administration of ACTH on Cortisol and Progesterone Levels in Ovariectomized Zebu Cows (Bos indicus)

Acta Veterinaria Scandinavica volume 38, pages 1–7 (1997)Cite this article

Abstract

Four zebu cows were bilaterally ovariectomized through lateral laparotomy Three months after ovariectomy, blood samples were collected by jugular venipuncture daily for 5 consecutive days prior to a single injection of ACTH to establish baseline concentrations of Cortisol and progesterone. Baseline concentrations of Cortisol and progesterone were 31 ± 5 nmol/L and 0.3 ± 0.01 nmol/L, respectively. On the day of ACTH treatment the cows were allowed to rest for 2 h to reduce the stress of cannulation before the sampling period started. Blood samples were collected every 30 min from 2 h before until 2 h after the injection of 6 µg ACTH and hourly between 2-6 h after ACTH injection. A significant increase was observed in Cortisol secretion from 90 min before until 120 min after ACTH injection. No significant increase was observed in progesterone secretion before ACTH injection. After ACTH injection progesterone was significantly elevated for 120 min. Four weeks after the ACTH treatment the cows were cannulajed again and blood samples were collected following the same bleeding schedule used during the ACTH experiment. Instead of ACTH a saline injection was given via the catheter. A significant increase in Cortisol concentration was recorded 90 min before saline injection. This increase was not accompanied by an elevation in progesterone concentration. No significant changes were observed in Cortisol and progesterone levels after saline injection. When Cortisol was added to a plasma pool having a progesterone concentration of 0.3 nmol/L and a Cortisol concentration of 25.4 nmol/L and assayed for progesterone in 2 different assays no increase in progesterone concentration was observed. We conclude that the adrenal glands can be an extra-ovarian source of progesterone during stress in Zebu cows.

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Acknowledgment

We are grateful to Dr. R. Toribio for collaborating in the field work and Instituto Tecnológico de Costa Rica for providing the animals. Financial assistance was provided by the Ministério de Agricultura y Ganaderia, Costa Rica and the Swedish Agency for Research in Developing Countries (SAREC).

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Authors and Affiliations

  1. Ministry of Agriculture, San José, Costa Rica

    J. M. Bolanos

  2. Department of Animal Science, University of Costa Rica, San José, Costa Rica

    J. R. Molina

  3. Department of Clinical Chemistry, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, P.O. Box 7038, S-750 07, Uppsala, Sweden

    M. Forsberg

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  1. J. M. Bolanos
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  2. J. R. Molina
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  3. M. Forsberg
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Correspondence to J. M. Bolanos.

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Bolanos, J.M., Molina, J.R. & Forsberg, M. Effect of Blood Sampling and Administration of ACTH on Cortisol and Progesterone Levels in Ovariectomized Zebu Cows (Bos indicus). Acta Vet Scand 38, 1–7 (1997). https://doi.org/10.1186/BF03548502

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Acta Veterinaria Scandinavica

ISSN: 1751-0147