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Calves should stand and nurse within 2 hours of birth if everything is normal and weather is not severe. For maximum antibody exposure from the colostrum, calves need to nurse within four hours of birth.
By 12 hours, the ability of a calf to absorb antibodies from colostrum is reduced by 50% by 24 hours he cannot absorb antibodies. Calves that don't get enough colostrum in the first 12 hours are more likely to have scours and respiratory problems. Calves should be processed at this time. All calves should be tagged.