Bovine Respiratory Disease risk categorization

Apr 5, 2013
by WLJ

The beef feeding industry recognizes that feeder calves entering the finishing, back grounding, or stocker phases of production pose several challenges and risks. Identifiable risks include the economic risk of the volatile purchase and sales prices of the cattle, the risks of increasing feed and ancillary costs, the risk of poor performance, and the risk of disease, death loss and the associated costs. In regards to animal health risks, Bovine Respiratory Disease (BRD) is the major disease risk for feeder and stocker cattle and the most demanding health challenge that producers face. Cattle feeders should prioritize to control BRD and minimize these risks with sound management and cooperative planning with their herd veterinarian.

BRD: Effects on production

Morbidity and mortality in newly weaned/received feeder cattle from BRD continues to be the most significant health problem facing the feeding industry. BRD accounts for well over 50 percent of all cattle treated for sickness, with reported average incidence rates in groups of calves at 14 percent (Loneragan, 2001). Several studies have documented the economic impacts of disease on the profit outcomes of calves. Direct costs attributable to BRD include death losses, treatment and labor costs, and prevention costs. BRD has been shown to impact growth performance and feed efficiency, days on feed, carcass merit and market value. The bottom-line of all studies indicates that BRD can decrease the returns of individual cattle from $50 to $250.

A summary of the Iowa Tri-County Steer Carcass Futurity Data (2002-2004) revealed the following:

• Healthy cattle returned $201.16 per head more than cattle treated twice for disease.

• Increased death loss and treatment accounted for up to $148.47 per head in lost revenue, while reductions in performance and carcass merit further reduced net return by an additional $52.69 per head.

• 17.5 percent of all calves (2,334) were treated as a primary result of BRD.

• Sick cattle lost three to four times more dollars from inferior quality grade than were returned for lower yield grade.

• Mortality rate was 100 times higher for cattle treated twice compared to non-treated cattle.

In a survey of feedlot consultant veterinarians (Terrell, 2012), the predictive factors for BRD morbidity and mortality were listed in order of importance:

1. Cattle health risk.

2. Weather patterns.

3. Labor quality and availability.

4. Receiving period nutrition.

5. Prevention programs utilized, such as vaccination, metaphylaxis and treatment protocols.

In addressing the number one predictive factor (the cattle themselves), it is recognized that the type, origin, age, source, and management background of the calves are factors that influence the health of the cattle. Additionally, the genetic, environmental, nutritional, and immune status also contributes to the risk of disease. Furthermore, the management stressors that are imposed upon calves will compound all these other factors. Pollreiz (1991), Smith (2001), and others have promoted a strategy to categorize the disease risk of feeder and stocker calves that is widely accepted. This is used to establish the risk potential for BRD, the market value of the calves accordingly, and the management strategies that are recommended for each category. These calves are assigned a BRD risk category according to the major predictive factors known to increase or decrease risk (See Figure 1).

A BRD risk assignment protocol is recommended to be developed by cattle feeders, with the aid of their consulting veterinarians, to establish health management programs to implement upon the arrival of feeder cattle. Furthermore, this system should be used to select and price calves to offer management controls on the economic risks for feeding each category. Lastly, each category should be thoroughly evaluated to determine the opportunity for profitability within the marketing programs utilized, particularly in grid/formula based and “natural beef” marketing programs. Steps taken to minimize adverse cattle health will enhance cattle feeding profitability through reduced costs and losses, improved performance and increased market value. Disease risk management is yet another tool to manage profit opportunity.

Reference: Field, T. (2007). Identifying Management Priorities in the Commercial Cow-Calf Business. Priorities First: Identifying Management Priorities in the Commercial Cow-Calf Business, (3). St. Joseph, MO: American Angus Association. — Roger Ellis, DVM, South Dakota State University