There are five named maria on the Moon: Mare Tranquillitatis, Mare Serenitatis, Mare Crisium, Mare Imbrium, and Mare Nectaris.
Mare
Usually not enough nutrition/space to go around inside the mare.
It makes no difference if mares and geldings are together when a mare is in heat. A gelding is a castrated horse and he has no sex drive or ability to impregnate a mare. Therefore a gelding would be like just another horse to a mare in heat.
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The Flanders mare !
A mare is a female horse
Your two mares may argue a bit, in order to determine the 'pecking order' or who is to be the dominant mare, but if given enough space, they will likely tolerate each other, and may eventually become tail to tail friends to mutually swat away flies.
A mare is a full grown female horse. An adult mare is called a mare. It is sometimes used as a euphemism for a married woman.
Mare
You make mare into colt as follows: MARE MALE MALT MOLT COLT
You put your own mare in the stables or get a friend's mare in your stables.