By de Kruif, A., Tijdschr Diergeneeskd, 2001
Description
At the end of May 1999 the author was asked by the Dutch Animal Health Service (GD) to evaluate problems with 'chronic wasting' cows on 13 farms. The cows were thought to have become ill after vaccination with an IBR marker vaccine. On nine farms a number of cows aborted shortly after vaccination. On eight farms lameness was a problem, as was mastitis. Diarrhoea occurred on four farms. A number of farms had problems with stillbirth, subfertility, abomasal displacement, and decreasing body condition. It was concluded that the abortions, stillbirth, and weak calves at birth in the first weeks after vaccination might be associated with the vaccination. However, the author found no indication that the other problems were associated with the vaccination. This was because the symptoms on the 13 farms were not uniform, and many of the herds already had problems before the herd was vaccinated. The 'chronic wasting' problem cannot be attributed to vaccination with the IBR marker vaccine. 'Chronic wasting' concerns a multifactorial complex of diseases, and has always been present, but has increased in incidence in the last years as a result of 'Holsteinization', a very high milk production, longer periods of housing indoors (and in many cases insufficient quality of the stable and cubicles), a too high work load, and insufficient management
At the end of May 1999 the author was asked by the Dutch Animal Health Service (GD) to evaluate problems with 'chronic wasting' cows on 13 farms. The cows were thought to have become ill after vaccination with an IBR marker vaccine. On nine farms a number of cows aborted shortly after vaccination. On eight farms lameness was a problem, as was mastitis. Diarrhoea occurred on four farms. A number of farms had problems with stillbirth, subfertility, abomasal displacement, and decreasing body condition. It was concluded that the abortions, stillbirth, and weak calves at birth in the first weeks after vaccination might be associated with the vaccination. However, the author found no indication that the other problems were associated with the vaccination. This was because the symptoms on the 13 farms were not uniform, and many of the herds already had problems before the herd was vaccinated. The 'chronic wasting' problem cannot be attributed to vaccination with the IBR marker vaccine. 'Chronic wasting' concerns a multifactorial complex of diseases, and has always been present, but has increased in incidence in the last years as a result of 'Holsteinization', a very high milk production, longer periods of housing indoors (and in many cases insufficient quality of the stable and cubicles), a too high work load, and insufficient management
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