Problem BVD infekcije u zapatima goveda i mogućnosti kontrole

Abstract

The greatest economic loses caused by BVDV infection in cattle farming are the direct consequences of transplacentary infection as a result of fetal deaths, congenital malformations, neonatal and postnatal mortality, including mucosal diseases, and slow growth and poor performance results of the surviving animals, as well as acute infections of respiratory and alimentary infections. The primary task of BVDV infection control is to prevent prenatal infection. This procedure includes the determination and elimination of persistently infected (PI) animals from the herd. After the removal of these animals, great attention must be paid to introducing new animals into the herd and preventing the occurrence of transplacentary infection. On the basis of existing data on distribution of BVDV infection in our region, the great economic loses it causes, the general tendency to resolve this problem in EU states, and for the competitiveness of our farmers in the production of milk, meat or breeding material after joining the EU market, it is necessary to draft legal regulations in control of this disease in our communities. The mentioned control could be based on the voluntary BVDV eradication program on herd's level in the beginning and on establishing herds with BVDV free status that will be recognized from the veterinary authorities. The herd can obtain the status of BVDV free herd based on the findings of two successive negative serological testing for BVDV antibodies of all animals in the herd aged between 7 and 13 months at an interval of 6 months. The maintaining of the status of BVDV free herd, which is based on the establishment of strict and controlled biosecurity measures and health surveillance, is verified in an interval of 6 months by control serological analysis of all animals in the herd aged between 7 and 13 months. If the positive serological finding on the presence of BVDV antibodies is detected among animals aged 7 to 13 months, all animals in the herd should be tested for the presence of BVD virus. All found PI animals should be from the herd. In the following period of one year all newborn calves up to 7 days of age should be tested for the presence of BVD virus (positive animals should be immediately excluded). After one year since the last PI animal was identified and removed, the serological testing of animals between the ages of 7 and 13 months, should be done. After two consecutive negative serological findings in the time frame of six months, the herd again obtain the BVDV free status.