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Vet Dave replies

Cut proud is a term from days gone by, and re­mains in use to de­scribe horses thought to be gelded but show­ing stal­lion-like be­hav­iour. It was thought that horses who were gelded and left with a first tes­ti­cle is not pos­si­ble then the horse re­mains ob­vi­ously en­tire un­til a sec­ond more ad­vanced pro­ce­dure can be per­formed to en­sure a com­plete geld­ing.

To de­ter­mine if a horse has testos­terone­pro­duc­ing tis­sue there are two op­tions. The first is to mea­sure oe­strone sul­phate lev­els with a blood sam­ple. This is an ex­cel­lent way to dis­tin­guish be­tween geld­ings and stal­lions in horses over five, and is very ac­cu­rate. Geld­ings pro­duce very lit­tle to no oe­strone sul­phate, rigs a mod­er­ate amount and stal­lions above a higher range.

For horses un­der five, a dy­namic test us­ing HCG is re­quired to de­ter­mine if there is the abil­ity for the body to pro­duce testos­terone on de­mand. This re­quires a pre and post in­jec­tion blood sam­ple. Geld­ings and im­ma­ture colts will show no abil­ity to pro­duce testos­terone, rigs a small rise in the sec­ond sam­ple and stal­lions a much larger rise. Both these tests are very ac­cu­rate for de­ter­min­ing if a male is en­tire, rig or a geld­ing.

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