Post foaling, the mare's uterus needs to discharge remaining fluid and return to it's original size (involute). By around 10 days post foaling the mare has gone through foal heat and completed the "cleaning stage".
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foaling
Foaling.
To calculate a mare's estimated foaling date, you can use the mare's last breeding date as a reference point. A mare typically has a gestation period of around 11 months (340 days), so you can add this to the last breeding date to estimate the foaling date. It's also a good practice to have a veterinarian confirm the pregnancy and monitor the mare's progress.
Preparing your mare for foaling in the proper way is essencial in her health. I have written an article on when my mare foaled, and how we prepared & cared for her, and our new foal. This is the link: http://www.ehow.com/how_4526561_prepare-mare-foaling.html
Ideally, foaling takes place in a specially built large stall called a foaling stall. When foaling outside in a herd, mares often separate themselves to foal. A few seek out the company of a special horse friend (usually another mare) or the herd while foaling.
To give birth to a foal (baby horse) by a mare (mother horse).
On Howrse Quiz it's Straw
It means that she is giving birth to a foal, or baby horse.
There are several foaling calculators available...one on The Horse.com
From entering the first stage of foaling, to the time that the foal comes out should not be longer than 4 hours.The foal should come out less than an hour after the second stage of parturition begins. The second stage begins after the rupture of the membranes (when the fluid comes out) - and abdominal straining will begin.If a foal takes longer than 1 hour to come out after the second stage has begun, it has a much lower chance of survival.1 hour after birth the foal should be standing, 2 hours after birth it should be suckling and 3 hours after birth the mare should have passed the placenta.
The mare should come back into heat (not including foaling heat) 21 days post foaling.