The typical stud farm will deworm their pregnant mares along with the other horses on an 8 to 12 week cycle

There are a few specific deworming medications that should not be given in early or late pregnancy, but your veterinarian will assign a safe type of dewormer, and prescribe an appropriate deworming schedule for your husbandry situation. Deworming is not usually performed during the last month and a half of pregnancy.

The two most commonly used dewormers are ivermectin and pyrantel based, but your veterinarian will review the fecal sample before prescribing the deworming therapy. Some stud farm veterinarians will also give the mare a dose of ivermectin on the day of foaling to decrease the transfer of Strongyloides westeri in the milk.

Other aspects of worm control are very important. Pasture rotation, removal of manure, low pasture grazing density, and harrowing of the pasture can all contribute to a significant reduction in the resident farm worm burden.

Other aspects of care that need to be adjusted during pregnancy include vaccination schedule and nutrition. Your veterinarian will be able to provide advice appropriate for your specific location etc.

The normal gestation of a mare is 340 days (335-342), but foals have survived pregnancies without intensive care support with a range of 320 days to 370 days! If you have had little or no experience with normal foalings, ask for references from your clinic. It is a good idea to read up about this event in advance so that you know what kind of things to have on hand, and when to call the veterinarian if the foaling is not progressing normally.

Source: http://www.animalhealthcare.ca/contents/content.asp?id=237&cat=farm

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