Liver diseases: Introduction. As a canary breeder you are probably familiar with the phenomenon: birds that sit a bit fat and insecure on the perch or on the bottom of the cage. On closer examination you will see a significantly swollen liver — and that is certainly not a good sign, especially if the liver is greatly enlarged, the bird is thin and also has red intestinal loops. A poorly functioning liver only partially functions, giving other diseases the opportunity to develop.
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