A fairly common complaint in veterinary practice is the gelding that acts like a stallion. These geldings may mount mares, act possessive of mares in a band, achieve an erection, or pursue mares even while being ridden. ... This should not happen if a gelding has been properly castrated.

Do geldings horses still mount mares?

In horses, as many as one third of completely castrated geldings will still achieve full erection, mount, insert, thrust, and ejaculate, especially when given pasture free access to females in estrus.

Can geldings and mares be kept together?

Understanding Mares and Geldings

Geldings are male horses who have been castrated, making them incapable of sexual reproduction. ... Mares and geldings can be kept together because no risk of reproduction exists and gender-based aggressive behaviors tend to be few and far between.