I have a maiden mare we bred this year. She was confirmed in foal at 17 days and re checked at 60 days. Everything looked great and she has shown no signs of being in heat, yet she is half he size of our other broodmare. What are the chances of her slipping her foal after a 60 day check? Does the number of foals effect how large the mare gets?
Last year I had a mare confirmed in foal at 16 days and again at 40 days... she was re-checked again at 90 days and found open. So she had lost the foal somewhere between that 40 and 90 days. Maiden mares can definitely look much smaller than broodmares that have had several foals. I have a maiden mare who is 9 months along, and she looks half the size of my other mare that has had 2 foals and is only 7 months along. So yes, the number of foals that a mare has had will affect how large they look during a pregnancy.
While most pregnancy losses occur during the early embryonic period, there are still significant numbers that are lost after that point.
It would be worth checking her again, and if she is again confirmed not in foal, it would be worth having a culture and cytology performed before rebreeding, and possibly even a uterine biopsy and culture.
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