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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Patterns of urinary oestrogen excretion in individual pregnant mares.

Urine collections (24 hr) were made at weekly intervals from four Pony mares from the 3rd or 4th month of pregnancy until parturition. Separation of oestrogens on Celite columns was followed by Kober measurements of oestrone and equilin. Individual differences were noted in peak amounts of total oestrogens excreted (200 to 800 mg/day), when oestrone constituted 80 to 95% at the 6th to 7th months. Although equilin increased in later gestation, oestrone remained the major product. Total oestrogen values decreased rapidly from the peak and then more gradually towards the end of pregnancy. During the last 3 weeks the decline in the ratio of oestrone to equilin was reversed in all mares.[1]


  1. Patterns of urinary oestrogen excretion in individual pregnant mares. Raeside, J.I., Liptrap, R.M. J. Reprod. Fertil. Suppl. (1975) [Pubmed]
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