Eimeria christenseni, Trichostrongylus colubriformis, pygmy goats (exper.), effects of concurrent subclinical infections on liveweight; apparent feed digestibility; balances of calcium, nitrogen, and phosphorus; serum copper and zinc concentrations; and bone matrix mineralization

gastrointestinal helminths in calves, field conditions, febantel, no activity against Moniezia benedeni, no signs of intoxication

Babesia bovis, nonviable tissue culture-derived antigens as vaccine in cattle, comparison with premunition

gastrointestinal parasites, horses, anthelmintic efficacy of ivermectin, adverse local or systemic reactions not observed

Amblyomma maculatum, experimental vector of Cowdria ruminantium in goats, other Amblyomma spp. unsuccessful; Theileria mutans in calves transmitted by Amblyomma variegatum, but not by other Amblyomma spp.

Leishmania donovani, amastigotes from dog marrow macrophages, ultrastructure

Strongylus vulgaris, migrating larvae in pony foals, fenbendazole in controlled tests

serum pepsinogen concentration, determination method, possibly useful in diagnosis of bovine and ovine ostertagiasis

Eimeria zuernii, E. bovis, calves (exper.), lasalocid sodium in various doses evaluated

The activity of ivermectin against common nematode parasites of sheep was examined in 2 experiments. In the 1st experiment, 14 sheep with naturally acquired infections were assigned to 2 groups of 7 sheep each. Sheep in 1 group were treated with 200 micrograms of ivermectin/kg of body weight and the remainder served as nontreated controls. In the 2nd experiment, 15 sheep with experimentally supplemented infections (including a benzimidazole-resistant strain of Haemonchus contortus) were assigned to 3 groups of 5 each. The 1st group was treated with 200 micrograms of ivermectin/kg, the 2nd was treated with 88 mg of thiabendazole/kg, and the 3rd served as nontreated controls. Ten to 12 days after treatment, all sheep were euthanatized and necropsied, and the parasites they harbored were recovered and identified. Efficacy of ivermectin was excellent (greater than 96%) against Dictyocaulus filaria, H contortus, Ostertagia circumcinta, Marshallagia marshalli, Trichostrongylus axei, T colubriformis, and T vitrinus. Treatment was not as uniformly effective for Nematodirus spathiger (73% to 85%), N filicollis (80% to 96%), Cooperia curticei (92% to 100%), immature nematodes (92% to 100%), and early 4th-stage larvae (46% to 100%). Efficacy of thiabendazole was poor for H contortus (42%) and early 4th-stage larvae in the abomasum (52%), but approached 100% for most of the other parasites.