A protein produced by cells after they have been exposed to a virus. Interferon prevents the virus from reproducing within the infected cells and can also induce resistance to the virus in other cells.
Calves can be ready for weaning by 3 to 4 weeks of age; however, in Penn State studies calves weaned at 3 weeks required extra attention. The increased time and labor required to get these calves eating starter suggest that waiting until 4 weeks of age would be prudent.
Bucket/bottle fed calves can. be slowly weaned off of liquid milk replacer when they are able to consume 2-3 lbs of dry matter per day (which can. happen as early as 4 weeks of age, but is typically closer to 8 weeks of age). Research shows that it takes at least 3.