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Parasite Control During Pregnancyin Horses

By

Patricia L. Sertich

, MS, VMD, DACT, New Bolton Center, School of Veterinary Medicine, University of Pennsylvania

Last full review/revision Feb 2021 | Content last modified Mar 2021

Most anthelmintics are safe for use throughout pregnancy, but precautions and contraindications on package inserts should be heeded. In general, anthelmintics Anthelmintics read more should not be administered to mares during the first 60 days of gestation (organogenesis). Parasite control programs should be tailored to meet the particular farm needs. Also see Gastrointestinal Parasites of Horses Gastrointestinal Parasites of Horses read more . Pregnant mares should be administered ivermectin or a benzimidazole 1–3 days before foaling to prevent lactogenic transmission of Strongyloides westeri, which can cause diarrhea in young foals.

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Management of the Neonate
Large animal neonates are born immunocompetent but lack antibodies. In their first few hours of life, neonates must suckle good quality colostrum from the dam to obtain maternal antibodies (immunoglobulins). Which of the following factors might compromise the quality of colostrum?
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