tions, including those that contain live or modifi ed-live virus, cannot be used in pregnant cattle because they can infect the fetus and cause abortion, stillbirth or developmental defects. A control program should aim to prevent fetal infec-
tions and eliminate losses or illness from transient BVD infection. Decreasing the amount of virus an infected animal sheds during a transient case of BVD can cut down on the possibility of infecting other animals. However, vaccinations alone should not be relied
upon to keep your herd free of BVD and PI animals. Good biosecurity measures should also be an integral
part of any BVD management or prevention program. Since infected animals shed the virus through body se- cretions including nasal discharge, tears, saliva, urine, feces, milk and semen, transmission can occur during embryo transplant, rectal examination and artifi cial insemination. Be sure any tools or equipment used to work cattle have been suffi ciently sterilized. Prevent cross-contamination from infected animals
by removing those that test positive for BVD, decrease contact between animals by increasing bunk space, decrease cattle density and implement improved fences. Consult with neighbors with nearby pastured animals
to prevent infections from other herds and make sure your fences are suffi cient to keep your cattle in — and other cattle out. Test cows, calves and non-pregnant females without
calves that have not been tested previously, including any replacement females, prior to breeding season. And since bulls can also carry and transmit BVD, don’t forget to test animals used in breeding or that have contact with your herd.
Peace of mind The Academy of Veterinary Consultants reports that
recent research found the reproductive losses associated with lower pregnancy rates, increased abortions and higher calf mortality are the greatest economic costs of exposure to PI animals. They also claim that up to 50 percent of persistently infected animals will appear normal and cannot be identifi ed visually. Managing your herd’s health by preventing an infec-
tion of BVD can remove important health risks to your herd. Testing, vaccination, good biosecurity measures, and maintaining good relationships with your veteri- narian and neighboring ranchers are all valuable tools to use in the fi ght against BVD.
tscra.org
August 2015 The Cattleman 59
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