Who wants PI?
John Maday
Drovers.com
You know the conversations that start “I have good news, and I have bad news.”
The good news is the industry has, in recent years, gained insight into the importance of BVD and its economic impacts, while also developing cost-effective testing and management strategies for controlling the disease.
The bad news is that control or elimination of BVD requires that producers identify persistently infected cattle and remove them from the conventional production and marketing system.
PI calves are carrier animals that survive after being infected with BVD virus early in gestation. While uncommon at about 1 percent of the total population, PI calves can appear perfectly healthy and still spread the BVD virus through herds and feedlot pens with great efficiency.
Identification and isolation of PI calves is the cornerstone of BVD-control strategies. Ideally, this occurs at the cow-calf stage, but some stocker and feedlot operations have adopted testing programs to protect animal health in their operations. Based on the potential losses from BVD, producers at any stage probably come out ahead, even if they take a total loss on the occasional PI animal. However, a PI calf that is healthy in other respects represents a significant value, and BVD poses no risk in terms of beef safety. This raises the question of whether producers might have an opportunity to capture some value by feeding PI calves to heavier weights.
