I have a mare which was pregnant and got birth for the third time ,and Foals died in the three times.?

Answers:
Your statement is pretty broad. What breed of horse, what were the symptoms of the foals, were they stillborn or live?
Personally, I wouldn't breed this mare anymore.

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thats strange. maybe your horse has some minor defective body parts that coused the death of all 3 foals? or some minor disease that k9lls while in womb? or something wrong with sire? tell your vet about this. this very strange? i'm sorry about the foals! i'm not sure?

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Did you do a necropsy to find out why the foals died? Were they from different sires? Did the foals nurse after they were born?

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That's very sad, and I am sorry for your losses. Perhaps your mare has a problem that is causing the foals to become ill and die- there is such a thing as Rh incompatibility in horses, and when it happens and the foal nurses, it gets antibodies which attack its system and make it very ill. If this goes on very long, the foal will almost certainly die- and it sounds as though this might be what happened with this mare. She should NOT be bred again, until you find out if this is the case. Otherwise, like the responder above me, I am also curious as to whether or not you had autopsies done on the foals to learn the cause of their deaths. The mare also needs to be examined in case she has problems with her reproductive tract which are causing her foals to die after birth. Other than this, though, I am not sure what to suggest. I am sorry about this- what a painful situation this must be for you. Good luck.

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Was the mare bred to the same stallion all 3 times? The stallion might have caused this. Did the mare abort early, or carry the foal to term? Was the foal a breeched birth? There could be a any number of causes of this problem, but I would not breed the mare until a full evaluation has been accomplished.