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.
Weaning process often takes 6 to 8 weeks for the calf and cow to completely be weaned from each other, no matter if you are separating the cow and calf so they don't hear or see each other, using fenceline weaning, nose-ring weaning, or doing natural weaning by letting the cow decide when to kick off her calf.rovide a bucket of water. If the calf eats grain you can wean it as early as 2 months, but three months is better and even later if it is really cold. You can stop feeding milk all of a sudden for older calves that eat a lot of grain, or feed milk only once a day for a while, or reduce each feeding.