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A markedly different response to the delayed neurotoxic effects of a single dose of 400 or 800 mg/kg of the organophosphorus anthelmintic haloxon was observed in two populations of sheep. Animals with a gentically determined low level of activity of the plasma enzyme A (aryl) esterase developed clinical signs of delayed neurotoxicity within one month. Lesions relating to degeneration of myelinated nerve fibers were seen in brain stem, spinal cord, and on occasion peripheral nerve.
View Article and Find Full Text PDFThe oral LD50 of a compound in hens does not reliably predict the neurotoxic dose of that compound. The oral LD50 in rats does not predict either the oral LD50 in hens or the neurotoxic dose in hens, so there is no justification for using the rat value to predict the neurotoxic dosage in hens. A strategy is presented for a stepwise approach to neurotoxicity testing in hens.
View Article and Find Full Text PDFSomatosensory-evoked responses (SER) were recorded in 3 Angora goats with moderate posterior paresis. The cause of posterior paresis was unknown. The goats had recently been given haloxon and had also been grazing in a pasture with carpetweed (Kallstroemia hirsutissima).
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