Review of sheep selenium status in the South Island 1992-93 to 1995-96

Authors: Simpson RA, Clark RG
Publication: New Zealand Veterinary Journal, Volume 45, Issue 2, pp 81-82, Apr 1997
Publisher: Taylor and Francis

Animal type: Livestock, Production animal, Ruminant, Sheep
Subject Terms: Clinical pathology, Diagnostic procedures, Diet/rations/food, Nutrition/metabolism, Selenium, Trace elements, Treatment/therapy
Article class: Correspondence

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Abstract: Before August 1993, selenium products were largely administered under the control of veterinary practitioners, with the exception of selenium topdressing prills and a small number of stock feed supplements and premixes. After that date, selenium restrictions were largely removed. In a review of cases of selenium toxicity in the 18 months following the removal of selenium restrictions, there did not appear to be any increase in the incidence of selenium toxicity. Comment from some veterinary practitioners has suggested an increase in the incidence of excessive use of selenium. This prompted a review of sheep liver selenium concentrations from cases submitted to Animal Health Laboratories at Invermay and Lincoln from South Island farms over the last four summer and autumn periods. The time period was chosen because lamb liver selenium status is often…

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