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[Progesterone determination in milk].

W J Smidt

    Tijdschrift Voor Diergeneeskunde
    |May 1, 1985
    PubMed
    Summary

    This study monitored progesterone levels in ten cows over ten hours to assess corpus luteum activity. Milk samples reliably indicated an active corpus luteum, though late samples sometimes showed variations.

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    Area of Science:

    • Reproductive biology
    • Endocrinology
    • Veterinary science

    Context:

    • Assessing reproductive status in cattle is crucial for herd management.
    • Progesterone monitoring is a key indicator of ovarian function and pregnancy.
    • Understanding corpus luteum activity aids in optimizing breeding programs.

    Purpose:

    • To determine the reliability of serial milk progesterone measurements for detecting corpus luteum activity in dairy cows.
    • To establish optimal sampling times for accurate progesterone analysis from milk.

    Summary:

    • Milk samples were collected hourly from ten cows over a ten-hour period to measure progesterone concentrations.
    • Progesterone levels were correlated with strippings, providing evidence of corpus luteum function.
    • Most samples reliably indicated an active corpus luteum, with potential exceptions in late-stage pre-milking samples.

    Impact:

    • Provides evidence for using serial milk progesterone measurements as a non-invasive method for reproductive monitoring in cows.
    • Informs optimal sampling strategies to maximize the accuracy of reproductive status assessments.
    • Contributes to improved reproductive efficiency and herd health management in cattle.

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