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In June 1998, 12 gilts were purchased at a new, small (annual production 250 piglets) farm. The animals were free from PRRSV antibodies. After one month of quarantine the gilts were placed in two separate pens - A and B. The first female was bred in mid-August and the last one at the beginning of October. In order to ensure the empty rooms at the nursery house were occupied, in mid-November the farmer...
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