Much depends on the breed and condition of the stallion himself and what his normal is OR was for fertility. Have you had his semen tested for viability , motility ,and actual count ?? Has he produced offspring before and is he still doing so OR when was the last time he successfully sired a foal??? If you are going age alone..there are still alot of factors you do need to consider.
I breed Welsh Cobs and my stallions sire was covering mares successfully til his mid 20's . Advertising for stud services isn't based on age... but rather what he produces and if he produces and produces well.
Advertising is advertising.... if you want to sell something .. you need to get the word out there. Or where you asking something else?
A colt may be able to reproduce at 9 months of age, and should therefore be separated from female horses at that time. Being able to reproduce and being offered for commercial breeding purposes are two very different things, and a colt is generally not offered for breeding intentionally until at least the age of 2. Even then, one is left with the question of whether he should be reproducing! Close evaluation of the animal and his fertility levels is recommended before offering him for breeding.
Ditto to JRH's comments on the advertising - I'm not sure what you're asking for there...
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