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Most calves are weaned between 120 and 290 days (3 to 10 months) after birth, but most producers like to wean their calves when they're around 205 (6 months) of age. Weight is also a factor, with the minimum being generally around 132lb (60kg).
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.n two experiments, 124 male and female calves were weaned at 3, 4, 5, or 6 weeks of age and studied through 8 weeks of age. Milk replacer for this study contained 22 percent protein and 15 percent fat and was fed at 10 percent of birth weight.