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Shariatpanahi, M. et al.

Distribution and toxicity of monosodium methanearsonate following oral administration of the herbicide to dairy sheep and goats.

Iranian fat-tailed sheep and dairy goats were administered the herbicide monosodium methanearsonate orally at a dose of 10 mg. MSMA (as arsenic) per kg. of body weight. The concentration time curves of MSMA in the blood of sheep and goats followed a first order composite exponential equation of the form: Cb(t) = Ae- alpha t + Be- beta t - C degrees be-kat. Absorption, distribution and elimination of MSMA, therefore, corresponds to an open two-compartment model. Arsenic from MSMA was readily absorbed from gastrointestinal tract and distributed in the body fluids and the various tissues. Approximately 90% of the arsenic was excreted in the urine within 120 hrs and small amounts were also recovered in feces. Arsenic accumulation in the tissues was low and urinary excretion was the most important exit route. Arsenic concentrations in milk were low when compared to the controls, which indicates that arsenic is not excreted in the milk to significant levels. The absorption, distribution and overall elimination rate constants for the two animal species studied were statistically different at the 0.95 level of confidence which indicates that there are apparently differences in MSMA metabolism by sheep and goats.[1]

References

Distribution and toxicity of monosodium methanearsonate following oral administration of the herbicide to dairy sheep and goats. Shariatpanahi, M., Anderson, A.C. Journal of environmental science and health. Part. B, Pesticides, food contaminants, and agricultural wastes. (1984) [Pubmed]

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