calendar icon 3 December 2018
clock icon 2 minute read

Selenium is a highly toxic mineral but it is required in very minute amounts for normal bodily functions. Selenium poisoning is rare and usually occurs when selenium supplement has been wrongly mixed into the ration. Levels above 3ppm in the diet have a clinical affect on the pig and when they reach 10ppm severe clinical signs develop. The toxic dose of selenium by injection is approximately 0.8mg/kg. Problems are more likely to occur with a deficiency producing muscle myopathies and mulberry heart disease.

Clinical signs

Pigs become anorexic with loss of hair and separation of hooves at the coronary band. Paralysis of front and hind legs is common. As the disease progresses there is liver and kidney failure and the pigs become toxic.


The clinical picture of selenium toxicity is characteristic and almost diagnostic. Confirmation is by the identification of abnormal levels in feed, the liver and the kidneys of affected pigs. Levels above 3ppm are diagnostic.


  • There is no specific treatment.

Emily Houghton

Editor, The Pig Site

Emily Houghton is a Zoology graduate from Cardiff University and was the editor of The Pig Site from October 2017 to May 2020. Emily has worked in livestock husbandry, and has written, conducted and assisted with research projects regarding the synthesis of welfare and productivity of free-range food species.

More Disease guide

View all

Porcine Circovirus (PCV1/PCV2/PCV3) (PCVAD)

calendar icon 6 May 2022
clock icon 1 minute read


calendar icon 4 December 2018
clock icon 1 minute read


calendar icon 3 December 2018
clock icon 1 minute read
© 2000 - 2023 - Global Ag Media. All Rights Reserved | No part of this site may be reproduced without permission.