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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.