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Impaired estrogen production by Leydig cells of the naturally retained testis in unilaterally cryptorchid boars and stallions
testis cryptorchid boar stallion estrogens
2009/2/23
Estrogen production in vitro was compared for Leydig cells from cryptorchid and scrotal testes in boars and stallions. Animals with natural and experimental cryptorchidism were used. Purified Leydig...
Effects of Hemicastration or hCG-treatment on Steroids in Testicular Vein and Jugular Vein Blood of Stallions
stallion androgens estrogens testicular vein hemicastration hCG-treatment
2009/2/19
The relationships among testicular vein and jugular vein concentrations of androgens and estrogens were studied in anesthetized stallions. Blood was sampled from a vein on the surface of the testis ...
Several reports have suggested that human semen quality has declined throughout the world over the last few decades. Chemicals in the environment acting as endocrine disrupters have been implicated ...
Gonadal and pituitary responsiveness of stallions is not down-regulated by prolonged pulsatile administration of GnRH
Equine hypothalamic-pituitary-gonadal axis ref ractoriness
2009/2/17
The objective of this study was to determine if prolonged pulsatile administration of homologous gonadotropin-releasing hormone (GnRH) at therapeutic or 5x therapeutic doses would cause down-regul...
HCG binding to the testicular LH receptor is similar in fertile, subfertile, and infertile stallions
Fertility horses testis
2009/2/17
Recent evidence in our laboratory suggests that the cause of idiopathic subfertility/infertility in breeding stallions may originate in the testes at the luteinizing hormone (LH) receptor or postr...
Dose-response effects of gonadotropin-releasing hormone on plasma concentrations of gonadotropins and testosterone in fertile and subfertile stallions
gonadotropin-releasing hormone luteinizing hormone follicle-stimulating hormone testosterone horse fertility
2009/2/11
Five fertile and five subfertile stallions were treated with a single intravenous injection of saline the first week followed by a single intravenous injection of varying doses of gonadotropin-rel...
Seasonal effects on seminal quality, plasma hormone concentrations, and GnRH-induced LH response in fertile and subfertile stallions
Stallions subfertility season hormones semen
2009/2/10
Seasonal effects on hormonal and seminal parameters in subfertile stallions have not been well documented and could provide information that is needed to understand the underlying endocrine mechan...