Hi Renee, Im no expert but I can tell you what its like with my gelding. He was a stud and out in the pasture w/mares for 10yrs. before I purchased him. He was gelded 1 mo. before I got him. When he first arrived ( only horse here )he was a love bug, absolute joy! he was fine when we got our next gelding...they were good buddies. A year later I purchased 2 mares....was very studdy the first week and I actually saw him attempt to mount 1 mare. She had a come to Jesus meeting with him and that put an end to him ever attempting to mate either mare. It only happened that one time as far as I could tell. But he would follow the mares around all the time and really got quite a crush on one particular mare...shared stall and hay. But he hated the other gelding even getting close to ANY of the mares...put his ears right back and would charge him...nothing bad, no bites or kicks but to this day he just thinks that all mares on this property belong to him. Its sounds like its bad but it really isnt anymore.....I just feel bad for the other gelding because he seemed to be getting pushed away from the girls.
I had never heard about a month for every yr. but I would think that every horse is different.
I will say that I think that I could never let gelding #1 out with a stallion...he's just too dominant however my other guy I think would be a good little companion for a mild mannered stallion. Im just to chicken to ever try it but they are good buddies through the fence. Good luck w/you soon to be gelding and let us know how it worked out!