Two methods for administering colostrum to newborn calves.

Comparison was of immunoglobulin G concentrations in blood serum of calves to which colostrum was administered by nipple bottle or by esophageal tube. Pooled batches of colostrum were given by the designated method soon after birth and at 12 and 24 h thereafter. Blood samples to measure immunoglobulin G concentrations were taken before initial feeding and at 4-h intervals thereafter through 32 h. The rate of increase of immunoglobulin G concentration following feeding was essentially the same for calves given colostrum by the two methods, and the concentration attained by 20 h after initial feeding was similar for the two groups and adequate for calf survival.