As calving season gets into full swing, you are probably preparing your farm to provide the best possible start for your new calf crop. A new calf crop is an exciting and stressful time on a farm. Most beef producers have an expected calf mortality rate, but suffering too much mortality can be devastating to your beef enterprise.
Managing critical control points at calving can help you have a successful calving season. According to a 2008 study by National Animal Health Monitoring System (NAHMS) and the United State Department of Agriculture (USDA), the highest calf loss is within several days after delivery, and the vast majority of losses occur during the first 3-4 weeks of life. Calves born dead accounted for nearly half of calf losses (44.5 percent) during the first 6 months of 2008. Another 13.5 percent of losses occurred in the first 24 hours following birth, and 28 percent of the losses occurred more than 24 hours but less than 3 weeks following birth. This information highlights how critical the parturition process and early post-partum period are for calf survival. Ensuring proper nutrition for dams, timely intervention during difficult calvings, and effective infectious disease control can help minimize calving losses.
There are several factors that contribute to calf mortality. Difficulty at calving is the most common reason for stillborn calves. Using calving ease sires is a long-term solution for preventing stillbirths. Another factor that increases stillbirths is interrupting labor. A cow should not be moved or interrupted from labor unless the calf’s feet are present. Moving or disputing the cow too often or at the wrong time can cause her to stop labor and may suffocate the calf internally. Besides stillbirths, hypothermia, infectious agents such as calf scours, navel infection, and pneumonia all contribute to the mortality numbers.
Wet and cold calves are more prone to hypothermia. Getting these calves warmed as quickly as possible is critical for survival. Warming lamps are a useful tool for drying calves, but should not be used long-term, as you risk increased pneumonia cases by overusing a heat lamp. Rectal temperatures can indicate the level of cold stress a calf is suffering. A reading of less than 100 degrees F indicates the calf is suffering cold stress. At 94 degrees F or lower, the vital organs are cold and brain functions have been impaired. Whenever a calf has a rectal temperature of 100 degrees F or lower, it should be a priority to warm the calf as soon as possible.