Brassica napus (rapeseed, summer rape, colza, coleseed, cole, canola, kale).
A member of the plant family CRUCIFERAE (BRASSICA). Annual or biennial, erect herbaceous
forage plant with bright yellow flowers and pod-like fruit.
Animals most affected
Cattle, sheep, pigs, poultry.
Poisoning has occurred where the proportion of seed-cake in the diet is too high.
The problem however is disappearing from veterinary practice today due to the introduction
of new plant varieties which have a lower thioglucoside content. In addition, different
treatment processes used in the production of the seed-cake have further reduced
the overall content of the toxic substances.
See entry for rape(forage).
Maximum absorbable level as a percentage of dry weight:
zerothio rape (improved) variety:
Clinical features and lesions
Reduced appetite in ruminants and pigs.
lowered milk production;
dermatitis in pigs.
metabolic dysfunction (hypoglycaemia).
No specific antidote. Symptomatic care only:
Re-introduce the feedstuff while reducing
the proportion of seed-cake.