This is typically a sign that the mare will foal very soon. There is no real term for the leaking, but if enough of it leaks out the foal might not get enough and need a colostrum supplement. A mare will 'bag up' (her udders become full) about a day or possibly more before foaling also.
Could be. This is a sign that birth is near. But sometimes a mare will 'wax up' and the milk will start to leak out. A little is fine but if too much leaks out the mare could be loosing the "colostrum". Colostrum is the first milk that the mare produces and it contains all the immunities for the new baby to keep him healthy. If it leaks out before the foal can drink it, he won't live long. They have to have the colostrum. If you think your mare is leaking too much colostrum call your vet.
Protien content is highest in the first milk/colostrum of the mare.
Many different things can cause a mare to not produce colostrum. The most common reasons are illness, hormonal imbalance, and fescue toxicity. Fescue toxicity is the most common and the most preventable reason for lack of colostrum in the mare. Removing a pregnant mare from infected fescue grass is vital to preventing this problem. Fescue grass also causes problems in joints, and possibly even an abort for a mare. I would make sure that she has plenty of clean water (no mud, algae, etc. in it) and get a few bales of premium hay for the lady. If you suspect fescue toxicity, do not waste time but I would call a vet to check her over well also.
The mother of a mare is called the dam.
The child of a mare is called a foal.
A foal gets his immunity from the first milk from the mare called colostrum. As long as the mare is healthy and current on her vaccinations the foal is good to go for about six months. At this point it is good to consult your vet to see what he recommends but this is about the time (give or take) to start his life-long series of vaccinations.
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.
A female horse is called a Mare baby horse is called a Filly
A female horse is called a mare.
A mare that has a foal is called a broodmare.
A Mare or a Filly
A mare may lactate days or even weeks before foaling, but this can be a serious foaling complication. A mare's first "milk" isn't milk at all. It's called colostrum and it contains the foal's immunity to disease. Some mares may leak a little colostrum before foaling. Usually the foal is born within about 48 hrs. If the mare begins to leak large amounts before foaling, you may need to be prepared for a complication after the foal is born. If all the colostrum has leaked out, there will be none, or not enough for the foal and the foal may become sick and die. A veterinarian can do a quick stallside test to see if the foal has eaten enough colostrum to give it the immunity it needs to survive. If the foal fails the test, IGg may be given to the foal orally (within the first 24 hrs) or thru an IV to save it.