SYNOPSIS Each of 4 bottle‐fed lambs received totals of 3500‐8100 sporulated oocysts of Eimeria intricata in series of 3‐6 inoculations during 4‐ to 14‐day periods; all produced oocysts of the parasite. The periods of patency in some infections indicated that only the earliest inoculations of a series may have produced oocysts. Fifteen other bottle‐fed lambs were inoculated, each with a single dose of 0.01‐2 million sporulated oocysts, and necropsied at intervals of 1‐2 days over 29 days. Parasites apparently resulting from the inoculations were found in only the lambs killed up to and including 17 days postinoculation; the most advanced stages were 2nd generation schizonts. It was concluded that a reaction occurred against the large numbers of asexual stages of E. intricata, which were evidently present, and the infections were terminated before formation of sexual stages.