Strongylus vulgaris, pony foals (nat. and exper.), effectiveness of fenbendazole against later fourth stage larvae assessed by larval motility and studies of cranial mesenteric, ileocolic, and celiac arteries

A study was conducted to determine aflatoxins in tissues and non-tissues of 2 Holstein cows given oral doses of 0.35 mg of purified aflatoxin B1/kg of body weight/day for 3 consecutive days. Cow 1 was slaughtered 24 hours after the 3rd dose, and cow 2, after day 3, was fed aflatoxin-free rations for 7 additional days before slaughter. Tissue samples of brain, gallbladder and bile, heart, intestine, kidney, liver, lung, mammary gland, skeletal muscle, spleen, supramammary lymph nodes, thymus, and tongue, and nontissue samples of blood, feces, milk, rumen content, and urine were examined. Aflatoxins B1 and M1 were found in all samples of cow 1, except the thymus. Kidney, liver, and mammary gland had the highest concentrations of total aflatoxins (57.9, 13.2, and 25.1 ng/g, respectively), with the aflatoxin M1 concentration 40 times more than the aflatoxin B1 level in kidney. Aflatoxin residues were present (0.02 to 0.11 ng/g) only in kidney, liver, and intestine of the tissues from cow 2 (fed aflatoxin-free feed for 7 additional days). Aflatoxin B1 was not present in nontissue samples, but aflatoxin M1 (0.10 and 1.5 ng/ml) was found in the last milk and urine samples from the same cow. Urine assays are a possible way to monitor the presence of aflatoxin residues in meat tissues.

Trypanosoma brucei in Peromyscus maniculatus, pathogenesis (hematologic, erythrocyte biochemical, and iron metabolic aspects)

Bunostomum phlebotomum experimental infection of beef calves superimposed upon naturally occurring gastrointestinal nematode infections, fenbendazole anthelmintic efficacy tested

Babesia bovis, B. bigemina, cattle, effect of tick control on infection rates and on enzootic stability, survey of farms from 6 geographical regions, control of ticks is not justified economically as means of minimizing risks of babesiosis outbreaks unless regular dipping is necessary to limit damage done by ticks per se

Rhipicephalus simus, 5 types of Anaplasma marginale colonies demonstrated in midgut

Sarcocystis spp. in infected meat from ox, sheep, goats, moose, elk, and mule deer fed to raccoons, none shed Sarcocystis sporocysts in feces

strongyles (predominantly cyathostomes), mares and their foals, dynamics of transmission studied on pastures previously free of parasites, fecal egg counts beginning day of parturition and based on time of year, relationship between weather conditions and pasture larval counts, necropsy findings in two foals: Texas

Theileria parva lawrencei, effect of halofuginone lactate against tick-induced infections in splenectomized Bos taurus, persistence of piroplasms in 3 out of 4 recovered animals

Sarcocystis capracanis, pregnant dairy goats immunized with a subclinical dose of sporocysts and subsequently challenged with lethal doses, concluded that: i) subclinical dose given in early pregnancy can cause fetal death without causing clinical disease in doe; ii) abortion can occur prior to development of 2nd-generation meronts; and iii) Sarcocystis-induced immunity is impaired during pregnancy