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acute selenium poisoning in cows and sheep caused by ingestion of plants with high selenium content (accumulator plants termed seleniferous). Clinical signs include ataxia, altered behavior (e.g., bellowing), wandering behavior, impaired vision, paresis; glossal and pharyngeal paralysis occurs in cattle. At high doses, a peracute course ends with respiratory arrest. Referred to as sheep staggers in sheep.
Synonym(s): acute selenium poisoning
not having the sense of sight. See also blindness.
double blind trial
an experiment in which the identity of the animals in the treatment and control groups is unknown to the experimenter and in addition the assessment of the results is done without the animals' identities being known to the experimenter. Called also blind study.
the identities of the animals that are in the treatment and the control groups are unknown to the experimenter until the end of the trial.
the area marking the site of entrance of the optic nerve on the retina; it is not sensitive to light.
see double blind trial (above).
see blind teat.
incoordination of any kind, including a tendency to fall, and recumbency if harassed.
incoordination, aimless wandering as in liver encephalopathy, carbohydrate engorgement.
see lactation tetany (2).
see paspalum ergot.
see ryegrass staggers.