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URINARY OESTROGENS IN THE STALLION
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1961
Year
FertilityGynecologyMature StallionsFemale Reproductive FunctionReproductive BiologyReproductive EndocrinologyFemale InfertilityReproductive MedicineUrine SamplesPublic HealthAnimal PhysiologyInfertilityThird OestrogenEndocrinologyUrologyTheriogenologyAnimal SciencePhysiologyVeterinary ScienceMedicineEndocrine ResearchReproductive Hormone
ABSTRACT Previous reports by other investigators on the presence of oestrone and oestradiol-17β in stallions' urine have been substantiated by chemical methods including infrared spectrophotometry. In addition a third oestrogen, oestradiol-17α, was isolated from this source. Quantitative chemical determinations of oestrogens in urine samples from 36 stallions from 7 to 37 months old, showed that only insignificant quantities were excreted during the first two years of life. At this time there was a marked increase, with oestrone predominating. In 8 mature stallions the average value for oestrone was 20.7 mg per litre of urine. Both oestradiol-17β and oestradiol-17α were excreted in amounts approximating 1/10 of this value. Using the same method only trace amounts of urinary oestrogens were recorded in 10 fully grown geldings.