ABSTRACT
Coccidiosis is a complex of diseases in many different hosts. Thus, the activity of a drug must be defined in terms of the species of coccidia and the effectiveness in a particular host. Field observations suggest that lasalocid offers improved coccidiosis control over other ionophores where monensin-tolerant E. tenella are present. When nicarbazin is combined with narasin, a synergism occurs which allows improved coccidiosis control with lower concentrations of each drug. During the 1960s and 1970s the sulfonamides and nitrofurans were used against bovine coccidiosis for treatment of clinically ill animals, although the efficacy of the products was somewhat limited. Amprolium is highly effective in prevention of coccidiosis in sheep when given continuously in the feed at 100 to 200 ppm. Baker et al. treated lambs with amprolium in the feed at 50 mg/kg/day for 21 days with good suppression of coccidiosis.
