| relationships among ecology, demography and diseases of european bison (bison bonasus). | the bison population in the bialowieza forest in poland has now grown to approximately 300, while the herds in the belarusian part of the forest total about 240 bison. the first signs of a health problem in these herds appeared in 1980, when two cases of balanoposthitis were detected in two bulls (2 and 5 years of age). since 1980 research has been conducted to explain the cause of diseases, particularly balanoposthitis, and to monitor the health of bison in bialowieza forest. a total number of ... | 2003 | 14703870 |