Final answer:
The most often recommended antiseptic for use on the navel stump of newborn calves is 5 percent saline solution.
Step-by-step explanation:
The most often recommended antiseptic for use on the navel stump of newborn calves is 5 percent saline solution. Antiseptics are substances that are applied to living tissue to reduce the presence of harmful microorganisms. In this case, the saline solution helps clean the navel stump and prevent infection in newborn calves. Using a 5 percent saline solution is recommended because it is effective in killing bacteria while also being gentle enough on the delicate skin of the newborn calves.