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Anticoccidial drugs: lesion scoring techniques in battery and floor-pen experiments with chickens.
Abstract Although lesion scoring is a commonly accepted criterion for determining the pathogenicity of coccidial species, no previous attempt has been made to standardize and describe the scoring… Expand
Histomoniasis in gnotobiotic chickens and turkeys: biological aspects of the role of bacteria in the etiology.
Abstract The bacterial requirements for producing infectious enterohepatitis in bacteria-free chickens were different from those for the disease in bacteria-free turkeys. When both Escherichia coli… Expand
Ascaridia galli (Nematoda): development and survival in gnotobiotic chickens.
Infection and growth rates of the fowl nematode Ascaridia galli were compared in germ-free, conventional, and other gnotobiotic chickens. Uniform experimental infections induced in chickens at 7–12… Expand
Practical immunization of chickens against coccidiosis using an attenuated strain of Eimeria tenella.
Three floor-pen trials were conducted to compare two attenuated strains of Eimeria tenella (Wis-F-96 and Wis-F-125) with the strain of E. tenella used in a commercial planned immunization program… Expand
Amplification of ionophore resistance in a field strain of Eimeria tenella by treating free sporozoites with monensin in vitro.
Monensin resistance in a field strain of Eimeria tenella (FS139) was successfully amplified by an in vitro method. Sporozoites of parent FS139, designated as FS139(0), were treated with monensin at 5… Expand
Eimeria tenella: clinical effects in partially immune and susceptible chickens.
Chickens made partially immune to E. tenella infection exhibited cecal lesions after challenge. Some of the chickens had cecal lesions of severity similar to those of birds having their first… Expand
Transmission of histomoniasis with male heterakis gallinarum (nematoda).
Histomoniasis was transmitted to poults inoculated orally with recently harvested whole intact male worms in three trials (4/5, 5/6, 2/4), but not with female worms (0/5, 0/9, 0/3). When triturated… Expand
Pathogenicity of Eimeria acervulina in light and heavy coccidial infections.
Two-week-old cockerels (124 birds) scored 0, +1, +2, +3, and -4 for lesions produced by Eimeria acervulina respectively gained 55, 51, 44, 35, and 38 grams. In a typical controlled experiment,… Expand
Eimeria tenella: relative survival of drug-resistant and drug-sensitive populations in floor pen chickens.
The effect was studied of introducing about equal numbers of decoquinate-sensitive or decoquinate-resistant Eimeria tenella oocysts into a floor pen of susceptible unmedicated chickens. "Sentinel"… Expand
Anticoccidial activity of salinomycin in floor-pen experiments with broilers.
The anticoccidial agent salinomycin (AHR-3096) was compared at various treatment levels (60 to 100 p.p.m.) in two experiments against unmedicated and either 100 or 121 p.p.m. monensin-medicated… Expand