Can a rig horse still impregnate?

It's impossible to definitively answer whether a rig horse can still impregnate without more information. Here's why:

* "Rig" can have multiple meanings:

* Castrated: If the horse is truly castrated (meaning the testicles are removed), then no, they cannot impregnate.

* "Rigged" as slang: This sometimes refers to a horse that is not fully castrated, meaning the testicles were not completely removed or they were not completely effective in rendering the horse infertile. In these cases, the horse might still be able to impregnate.

To know for sure, you would need to consider:

* The horse's history: Was it properly castrated? What type of procedure was performed?

* The horse's physical condition: Are there signs of residual testicular tissue?

* Previous breeding attempts: Has the horse been bred before, and if so, were there successful pregnancies?

If you have any concerns about a rig horse's ability to impregnate, it is always best to consult a veterinarian. They can examine the horse and provide you with the most accurate information.