Calves born after dystocia (calving difficulty)are at a high risk of failing to receive adequate colostrum by natural suckling because of greatly decreased colostrum intake. Calves that are born to a prolonged stage II of parturition very often suffer from severe respiratory acidosis. Acidotic calves are less efficient at absorbing colostral immunoglobulins even if artificially fed colostrum; therefore, effort should be made to provide weak newborn calves with the best source of colostrum available via bottle suckling or tube feeding.
The amount of immunoglobulin ingested is also a major determinant of final serum immunoglobulin concentration. A practical "rule-of-thumb" is to feed 5 to 6% of the calf's body weight within the first 6 hours and repeat the feeding when the calf is about 12 hours old. For an 80 pound calf, this will equate to approximately 2 quarts of colostrum per feeding.