We found a number of very black tongues at the age of about 23 weeks old parent stock poultry. Afterwards they have many leg problems, every day there is about 10 animals for selection in a herd of 12.000 animals.
Dear Bert,
It is very difficult to provide clear diagnosis with the history given. Development of black tongues is very new. Any stress or new kind of mycotoxin in the feed or any fungal infection? Let me know, you made any diagnosis now. You may find the attached file useful.
Yes. The ingestion of mycotoxins can lead to the development of leg and joint problems in poultry, a condition termed avian tibial chondrodysplasia (Walser et al., 1988). The history of black tongue in this same age group of birds, may also be linked with exposure to mycotoxins. Black tongue has been described in growers exposed to dietary 4,15-Diacetoxiscirpenol - a Type A trichothecene (Diaz, 2002).
References
Diaz, G. J. (2002). Evaluation of the efficacy of a feed additive to ameliorate the toxic effects of 4, 15-diacetoxiscirpenol in growing chicks. Poultry science, 81(10), 1492-1495.
Walser MM, Morris VC, Levander OA (1988). Effect of dietary selenium on the development of Fusarium-induced tibial dyschondroplasia in broiler chickens. Avian Dis 32:84–88.
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