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The first clinical cases of proliferative ileitis were recognized in two large pig farms in the western part of Poland in 1995. Both farms were well managed and had a high hygienic status. A reproductive herd in farm P consisted of approx. 350 sows and in newly established farm S of 170 gilts and 20 boars. The clinical picture of the disease was observed in about 10 per cent of weaned and fattening...
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