A year or at least an entire grazing season is required. This is usually impractical and it also means that the kind of rotational grazing at short intervals used to maximize pasture production usually doesn't have much impact on parasites. Goats seem to be more sensitive than other livestock species in terms of abortion in late lactation. Abortion cases have been reported. However, it is not clear whether or not abortion was provoked by the wormer used or simply by the stress related to animal handling and deworming.
Some products are to be avoided.
Albendazole should not be used in pregnant does. The primary pathology associated with coccidiosis involves intestinal cell destruction. Scarring of the intestine following treatment or recovery may result in a permanently unthrifty animal. Diagnosis is based on history, symptoms and microscopic examination. In the presence of appropriate temperature, moisture and oxygen, coccidia eggs passed in the feces become infective in one to several days and readily contaminate food and water.