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Epinephrine inhibiting milk ejection in lactating cows.

R A Sibaja, G H Schmidt

    Journal of Dairy Science
    |March 1, 1975
    PubMed
    Summary
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    Epinephrine administration inhibits milk ejection in Holstein cows by suppressing oxytocin release from the neurohypophysis. This stress hormone significantly lowers peak oxytocin concentrations during milking.

    Area of Science:

    • Veterinary Medicine
    • Endocrinology
    • Animal Science

    Background:

    • Oxytocin is crucial for milk ejection during milking.
    • Epinephrine, a stress hormone, can influence physiological processes in dairy cows.

    Purpose of the Study:

    • To investigate the effect of epinephrine on blood oxytocin concentrations and milk ejection in Holstein cows.
    • To determine if epinephrine inhibits oxytocin release during milking.

    Main Methods:

    • Blood samples were collected from 10 Holstein cows during normal milking and after intravenous epinephrine injection.
    • Oxytocin concentrations were measured using radioimmunoassay.
    • Milk production was monitored to assess milk ejection.

    Main Results:

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    • Normal milking resulted in peak oxytocin concentrations of 399.7 muU/ml plasma.
    • Epinephrine administration significantly reduced peak oxytocin concentrations (1.05-8.6 muU/ml plasma) and inhibited milk ejection.
    • A beta-receptor blocker confirmed epinephrine's inhibitory effect at the myoepithelial cell level.

    Conclusions:

    • Epinephrine inhibits milk ejection in dairy cows.
    • Epinephrine suppresses the release of oxytocin from the neurohypophysis.
    • Stress during milking can negatively impact milk letdown through hormonal mechanisms.