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.


[affected.gif] Animals most affected
Cattle, sheep, pigs, poultry.


[etiology.gif] Etiology
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.



[toxic.gif] Toxicity
See entry for rape(forage).

Maximum absorbable level as a percentage of dry weight:
standard seed-cake:
cattle 10-15
sheep 5-10
pigs 3-6
laying hens 3-7
chickens 10-12

zerothio rape (improved) variety:
pigs 20

   


[clinical.gif] Clinical features and lesions

Reduced appetite in ruminants and pigs.

Antithyroid/antigoitrogenic effects
In adults:

In juveniles:


[treatm~1.gif] Treatment
No specific antidote. Symptomatic care only: