The Fight Against BRD Starts in the Cow Herd
By: Che Trejo, DVM, MS, Beef Technical Services, Zoetis
Reducing bovine respiratory disease (BRD) starts with preventing bovine viral diarrhea virus (BVDV) in the cow herd
It’s estimated that nearly 9% of beef cattle operations have a calf persistently infected (PI) with bovine viral diarrhea virus (BVDV).1 This might seem like a small percentage, but presence of BVDV can mean a risk for something more. Producers are 43% more likely to need to treat bovine respiratory disease (BRD) in feedlot calves exposed to a BVD-PI animal, a study found.2
Reducing exposure to BVDV is an important place to start in the battle against BRD:
• Step 1: Vaccinate the cow herd before breeding. Only 28% of operations report vaccinating cows for BVDV.1 Yet, a nonvaccinated cow herd is like an uninsured driver out on the road. No contact, and you likely won’t have any issues. But any contact, and you could have a costly disaster.
o Modified-live virus (MLV) vaccination program: BVDV is most commonly spread by a PI animal acting as a carrier for the virus, so using MLV vaccines that offer protection against BVD-PI calves is the most effective way to protect the cow and unborn calf.3,4 Look for a specific statement on the vaccine label that the vaccine prevents calves from being persistently infected with BVD Types 1 and 2 viruses.
o Alternative vaccination program: If you can’t implement or maintain a pregnant cow MLV vaccination program, research demonstrates there’s an effective alternative. Heifers can be given two prebreeding doses of Bovi-Shield Gold FP® 5. This can be followed by either annual revaccination with the same MLV vaccine or CattleMaster Gold FP® 5, a combination inactivated BVD vaccine containing a temperature-sensitive infectious bovine rhinotracheitis (IBR) component. The study demonstrated effective protection against BVD or IBR exposure with both cow herd vaccination program options.5
• Step 2: Test and remove PI calves. While producers are generally aware of BVDV, a study shared only 4.2% of operations reported testing calves for persistent infection with the virus.1 However, 70% to 90% of BVD infections are subclinical — so most PI calves appear normal — but these animals continually shed the virus and pose a constant risk of exposure to nonprotected cattle.3
o Test all calves before bull turnout and any incoming cattle, including heifers, cows, bulls and calves born from purchased pregnant cows or heifers. Dams of any positive calves also need to be tested.
• Step 3: Protect young calves from BVDV. Protecting the unborn calf with a cow herd vaccination program is step one. Another important step is implementing an effective young calf respiratory program that protects against bovine respiratory syncytial virus (BRSV), IBR, parainfluenza 3 (PI3), BVD Types 1 and 2 viruses and Mannheimia haemolytica. BRD has many causes and complexities, but BVDV Types 1 and 2 are two of the major viral causes of BRD. BVDV also suppresses the immune system, which can lead to secondary infections from BRD pathogens.
o BRSV vaccination at birth with an intranasal vaccination followed by a booster vaccination at branding may have some disease-sparing effects during summer exposure to BRSV, according to a study in Montana.6
o Vaccination on arrival at the feedlot alone with Inforce 3® and One Shot® BVD (no antibiotic on arrival) has been shown to significantly reduce (p = 0.01) second and third treatments for BRD when compared with another vaccination protocol.7
These steps to help control BVDV in the cow/calf operation can reduce the potential of a BVD-PI animal, improve overall cattle health in your herd and help reduce the risk for BRD in the calves you sell.
For more information on controlling BVDV in your cow/calf operation, work with your herd veterinarian or visit FetalCalfProtection.com for information on a complete range of cow herd vaccinations from Zoetis. For more information and articles about managing BRD, visit BRD-Solutions.com/Insights.