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Related Experiment Videos

Bovine plasma corticoids during parturition.

S Hudson, M Mullford, W G Whittlestone

    Journal of Dairy Science
    |April 1, 1976
    PubMed
    Summary

    Plasma adrenal corticoid concentrations in cows rise sharply before calving and peak during labor. Levels drop significantly after birth, returning to normal within three days, indicating labor

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    Area of Science:

    • Reproductive endocrinology
    • Veterinary physiology

    Background:

    • Adrenal corticoids play a crucial role in the physiological stress response.
    • Parturition is a significant physiological event involving hormonal changes.

    Purpose of the Study:

    • To investigate the dynamic changes in plasma adrenal corticoid concentrations in cows before, during, and after parturition.
    • To determine the influence of labor on these hormonal fluctuations.

    Main Methods:

    • Plasma samples were collected from 21 cows at multiple time points around parturition.
    • Adrenal corticoid concentrations were measured using a competitive protein-binding assay.
    • Blood sampling frequency increased during labor.

    Main Results:

    • Prepartum corticoid levels averaged 6 ng/ml, rising sharply in the 16 hours preceding calving.
    • Corticoid concentrations peaked at 19.2 ng/ml during calving.
    • A significant decrease to 11.2 ng/ml was observed 1 hour postpartum, returning to basal levels by 3 days postpartum.
    • Evidence suggests labor is the primary driver for elevated corticoid levels.

    Conclusions:

    • Plasma adrenal corticoid levels exhibit a distinct pattern around parturition in cows, significantly influenced by labor.
    • These findings contribute to understanding the physiological stress response during bovine calving.

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