The aim of this experiment was to breed a cardio-pulmonar syndrome in common foxes with the help of a taurine deficit and to examine the influence of this amino acid on the prevention and treatment of the disease. The experiment was conducted on two fox farms in the period from July to December. On the first farm, 90 (5-6 week-old) animals were randomly chosen from among 1100 pups. They were divided into three equal groups. The first control group (C-group) consisted of animals which were fed in the same way as other animals. Meat components constituted 65-70% of the feed; vegetable components with vitamin-mineral supplements constituted 30-35% of the feed. The foxes in the second group (E - experimental) and third group (ET - experimental with taurine) were fed with the same feed as those from the first group, but the proportions of meat and vegetable components were inverted and all feed components were cooked. Taurine was added to the feed in the ET group. The average taurine contents in blood serum and bile was the lowest in the E group, and in spite of its low level foxes did not suffer from lung-heart syndrome. On the second farm, where cases of lung-heart syndrome occured, 150 pups were given normal feed with taurine suplement, and 150 pups - feed with no taurine suplement. The disease occured in 7 (4.66%) and 9 (6.0%) foxes, respectively. Two foxes in each group were cured - that is 28.57% and 22.2%, respectively.
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