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Oestrogens in milk.

P Gyawu, G S Pope

    Journal of Steroid Biochemistry
    |July 1, 1983
    PubMed
    Summary

    Cattle milk contains steroid oestrogens like oestradiol-17 beta and oestrone. Oestrone sulphate in milk can indicate pregnancy, while oestradiol-17 beta levels aid in studying ovarian function post-partum.

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    Area of Science:

    • Veterinary endocrinology
    • Reproductive physiology in cattle

    Background:

    • Steroid oestrogens, including oestradiol-17 beta, oestrone, and oestradiol-17 alpha, are present in cattle body fluids and tissues.
    • Evidence suggests the presence of oestrone sulphate and potentially oestriol in cattle.

    Purpose of the Study:

    • To investigate the presence and significance of various oestrogens in cattle.
    • To explore the relationship between systemic oestrogen levels and their concentrations in milk.
    • To assess the utility of milk oestrogen measurements for reproductive diagnostics in cattle.

    Main Methods:

    • Identification of steroid oestrogens in cattle body fluids and tissues.
    • Comparison of oestrogen concentrations in systemic plasma and milk.
    • Evaluation of oestrone sulphate as a pregnancy marker in cattle.
    • Correlation analysis of oestradiol-17 beta in plasma and milk for non-pregnant cows.

    Main Results:

    • Oestrogens found in systemic plasma are also present in milk at similar concentrations.
    • Oestrone sulphate is primarily found in pregnant cattle, serving as a practical pregnancy test.
    • A strong correlation exists between systemic plasma and milk concentrations of oestradiol-17 beta in non-pregnant cows.

    Conclusions:

    • Milk oestrogen profiles reflect systemic levels, with potential mammary gland metabolism being uncertain.
    • Oestrone sulphate in milk is a reliable indicator of pregnancy in cattle.
    • Milk oestradiol-17 beta and progesterone levels are valuable tools for studying post-partum ovarian function in cows.

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