Well... mares will keep you guessing at every turn before giving up what they are holding. If you think that vet wasn't as experienced as the other vet, I'm not sure how much I would trust her. There are vets that should not be Equine Reproduction Veternarians. My question to you, is the second vet that checked her an Equine Specialist or mostly small animals? The reason I ask, is my vet is mostly small animals but does do equine. She missed my mares foal twice. Once from 16-30 days of age (on a sonogram) and then again at 120 days. Now... to my knowledge that can happen quiet alot. (Only reason I use her is the other Equine vet around here is pshyco and almost got one of my mares killed.)
Also I have a few questions to you... You said her feed changed. How much did you change it by? Normally you wait until the last trimester to change the feed of your mare.
Now to answer your questions.
The stall should be at LEAST 16 x 20. Bedded with straw or hay, not shavings as the shaving will stick to the mares vagina and can also stick to the foals nose and other things, also can cause breathing problems and so on.
This will be difficult but you should put your mare in the enviroment she will foal in a month before her due date. Now, if you choose to somewhat believe the second vet, I would start putting her as soon as you can at night.
Some signs that can give you a hint that your mare is close is a tough one. As all mares and pregnancy's can differ, remember the signs may not be exact in your mare.
A few signs that I know by heart-
- A month prior to foaling she will "bag" up. Beginning to produce mammary glands.
- 2 weeks to 2 days before she will begin to wax up. (Normally a good sign, but not always.)
I can't really think of any "good" sites. I've went through them all. Just google "Foaling signs" or "Mare close to foaling". Just play around and you will get a good website sooner or later.
A good habit to get into is checked her udder. Also, touching it. Some mares won't mind you touching it now, but when it gets full and hot they won't be to inclined to let you reach under there.