Originally Posted by Poco1220
We breed for temperment and disposition, we do not think that conformation or bloodlines.
^ straight off the homepage for her website. This is very sad to see. Confirmation IS important! And FYI temperment/disposition is the same thing.
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Not a breeder myself but ridden 7½ years at a stable in which they also bred horses...
Also bloodline is important. There are recessive attributes in bloodline which don't perhaps exist in your horse but will exist in the offspring. It's also important that mare/stud bloodlines work out together so you can maximize the quality of offsping. That serves the race best and helps to develop it.
About the question to geld or not... Like I said I'm not a breeder and I don't have an eye for potential breediing material so I can't 'rate' your horse but I can give some advice: search more information about your stallion's bloodline and other studs in that breed so you can do a bit comparison. Try to clarify some things like if your stallion can give something to the breed or not? Can you offer proper environment for breeding? Base your decision on things like that.