Recent research at the University of Minnesota indicates that colostrum replacer volume matters a great deal when it comes to passive transfer. And the method of delivery matters at low volumes.
Results presented at the Minnesota Dairy Health Conference in May showed that calves fed 3 liters (3.18 quarts) of colostrum replacer per day (200 grams of IgG) had significantly higher levels of passive transfer than calves fed 1.5 liters (1.59 quarts) of colostrum replacer per day (100 grams of IgG).
Calves that received the lower volume via a nipple bottle showed an average 10.6-percent increase in apparent efficiency of absorption of IgG over calves fed the same dose with an esophageal feeder tube. Meanwhile, passive transfer seemed to be unaffected by feed-delivery method for calves fed the higher dose of colostrum replacer.