The first Mini foals we raised were out of mares that we bought already bred. We had the due dates the sellers gave us, but I was never sure just how many days they were figuring on to get those due dates. The one mare foaled a month early (for the seller) with her first foal, & 3 weeks early for her first foal for us. But, I don't know how many days gestation they were actually at when they foaled. The filly that came 3 weeks early did look a little premature, but not too bad. Another mare foaled "2 weeks early" but again I don't honestly know if she was early or not, based on days.
I personally figure our due dates at 325 days gestation. There are exceptions. We have one mare that seems to always go 335-340 days; another mare last year (1st foal for us) went at 340 days. One mare went right on time. Two others went early--Kathy was 3 weeks early, putting her at 304 days when she foaled. Timie went a full month earlier than the 325 days I had figured for her--so that foal was only 296 days gestation. Both these foals were healthy colts that looked to be full term.
As for early = filly & late = colt, that just isn't accurate. The two foals we had born at 296 & 304 days last year were colts. The 3 fillies we had last year came at 325, 335 & 340 days. Of the two "early" foals Sherry had in previous years, the month early one was a colt, the 3 weeks early one was a filly. Flame's '03 foal that we figured was 2 weeks early was a colt. Technically, here the rule is more like early=colt & later=filly!
The first Mini foals we raised were out of mares that we bought already bred. We had the due dates the sellers gave us, but I was never sure just how many days they were figuring on to get those due dates. The one mare foaled a month early (for the seller) with her first foal, & 3 weeks early for her first foal for us. But, I don't know how many days gestation they were actually at when they foaled. The filly that came 3 weeks early did look a little premature, but not too bad. Another mare foaled "2 weeks early" but again I don't honestly know if she was early or not, based on days.
I personally figure our due dates at 325 days gestation. There are exceptions. We have one mare that seems to always go 335-340 days; another mare last year (1st foal for us) went at 340 days. One mare went right on time. Two others went early--Kathy was 3 weeks early, putting her at 304 days when she foaled. Timie went a full month earlier than the 325 days I had figured for her--so that foal was only 296 days gestation. Both these foals were healthy colts that looked to be full term.
As for early = filly & late = colt, that just isn't accurate. The two foals we had born at 296 & 304 days last year were colts. The 3 fillies we had last year came at 325, 335 & 340 days. Of the two "early" foals Sherry had in previous years, the month early one was a colt, the 3 weeks early one was a filly. Flame's '03 foal that we figured was 2 weeks early was a colt. Technically, here the rule is more like early=colt & later=filly!